• Olddog (unregistered) in reply to RevMike
    RevMike:

    Anonymous:
    You are right, but they needed to take it a step further.  They needed "dual tech" motion detectors that couple PIR and a zoned motion detector.  That way the door would only open when an infra-red radiation source (body heat) and human sized object moving (in order to trip two of the zones at a time, this was designed to stop false alarms caused by rodents).  Draw backs would be 3 times the cost.  Of course, I doubt it was as expensive as re-fitting all of those doors, what a mess up.

     It sounds good, but it is even more difficult to get a system like that which passes safety regulations.  Ever since the Triangle Shirtwaist Factory Fire http://en.wikipedia.org/wiki/Triangle_Shirtwaist_Factory_fire in 1911, there have been lots of regulations about appropriate emergency exits.  Essentially no one other than prisons are going to create a set of positive barriers to egress that might not be easily overcome in case of an emergency.  In all likelihood, the sliding doors would, if pushed moderately hard, swing open.
     

    Perhaps the fancy doors weren't such a good idea. That's what you get for using a cutting-edge fancy architect. You get fancy new problems.  Architects are famous for re-inventing the wheel, so to speak. So, it's not suprising if the doors are the only security problem. If it was me... I'd suspect other little security details were over-looked, in the name of aesthetics.

  • Jason (unregistered) in reply to jtwine

    At the a major company I worked for about ten years ago, we used this sheet of paper trick ourselves whenever we forgot our badge, etc. I am pretty sure they used infra-red sensors, there as anything else is substantially more expensive. When we figured this out, we were astonished at the implications (our personal risk and the risk to the company) and resolved to keep it pretty secret for our own use  in special cases.

     

  • (cs) in reply to GoatCheez
    GoatCheez:

    So the WTF is that there was an unforseen security hole that was caught in time and fixed? WTF?

     

    Of course.... did they ever try sliding underneath? 

    prolly not, no one was that thin...

    wokka wokka 

  • (cs)

    now lets see how many ways to skin that cat....one...two...three...

     

  • Mats Gefvert (unregistered) in reply to jtwine

    This reminds me of an experience a colleague of mine had when installing our system in a new client's server room during a similar all-nighter. He closed the door from the inside, not realizing that the guy he was with didn't have his rfid badge with him.

    The situation was further complicated by the fact that it was late at night, they were unable to get ahold of anyone else with access clearance by cell phone, and the guy he was with badly needed to go to the restroom.

    In the end, the guy relieved himself in a secluded corner of the server hall. Fortunately enough, it wasn't the "Number Two". That must have been an interesting wtf for the morning shift. :)

  • Jason (unregistered) in reply to ranthoron

    Oh yeah. That would be a serious WTF... Throw a BURNING PIECE OF PAPER under the door :-)

     

  • (cs) in reply to Zylon

    Anonymous:
    For the life of me, I can't figure out why you described a yardstick as "approx a meter" in length instead of "exactly one yard".


    Just what are the chances someone doesn't know what a yardstick is, but knows how long a yard is? That's like saying a mile is a mile long.... Very correct, also very useless...

    Chances are the original person who asked what a yardstick is, is from a country that uses metric measurements, therefore describing a yardstick as a stick approximately a meter in length is exactly right.

    -Me 

  • (cs) in reply to m0ffx
    m0ffx:

    I would have been inclined to think the rfid should have been needed for getting out also though. That way anyone who's gained unauthorised entry to, e.g. by tailing someone, also has to do the same to get out, and is thus more likely to get caught.

    Can we say "Fire Codes"?

    -Me 

  • yeah (unregistered) in reply to Pool's Closed

    Anonymous:
    I think the real wtf here is that i have aids AMIRITE PPL?????
     

    ummm...ok

  • dwayne (unregistered) in reply to Steamer2k
    Anonymous:
    Alex Papadimoulis:

     The only thing that was missing was the cool "whoosh" noise and an access panel that could be shot with a phaser to permanently seal or, depending on the plot, automatically open the door.

    :D That's jolly.

    I laughed more at this line then the actual story. I miss TNG.
  • Michael Lush (unregistered) in reply to GoatCheez
    GoatCheez:
    So the WTF is that there was an unforseen security hole that was caught in time and fixed? WTF? Of course.... did they ever try sliding underneath?

    They should have,  the Yardstick injection attack is about as old as motion sensor controled doors. WTF are they doing selling this crap?

  • (cs)

    Hi there!

    It's my first day as a member on the Daily WTF :).

    I've something to share with You all, but since I don't have enough permissions to start a new thread I'll post it here.

    Visit http://www.kppd.pl/Dokumenty_KPPD/haslo.htm.

    It's not in English but when You will have a look on the source code of the page, You will definitely find it amusing. :) WTF?!

    I could only congratulate to author of this page for His Advanced Security Skills. :)

    Bye.

  • (cs) in reply to quadesh
  • LRB (unregistered) in reply to quadesh

    This reminds me when I worked at the corporate headquarters of a major Telco.  You needed a badge to get in and had to press a bar to get out.  The easiest way to get in was just to tailgate on someone with a badge going in or out.  However, if you needed in and there wasn't any traffic present, you could enter the elevator which was located outside the secure door.  Then press the open door for the freight door located directly across from the door entered.  This let you into the freight area, which had an unsecured door into the secure level. 

  • (cs) in reply to Uncoolperson
    Uncoolperson:
    BitTwiddler:

    fluffy777:
    I like how the focus of the picture is on the bathroom.

     ...while we're on the subject, have you ever noticed that the "emergency exit plan" maps are detailed down to the level of showing which way the stall doors open? As if you're going to run out into the elevator lobby with your pants down around your ankles and your hair on fire, to check whether the stall door swings in or out, left or right?

     you have a better way to represent a door?

    I'm thinking just the general location of the bathroom is sufficient for the emergency exit maps that I see posted in elevator lobbies, etc. But no, they have to show exactly how many stalls there are vs how many urinals.

  • Olddog (unregistered) in reply to quadesh
    quadesh:

    Hi there!

    It's my first day as a member on the Daily WTF :).

    I've something to share with You all, but since I don't have enough permissions to start a new thread I'll post it here.

    Visit http://www.kppd.pl/Dokumenty_KPPD/haslo.htm.

    It's not in English but when You will have a look on the source code of the page, You will definitely find it amusing. :) WTF?!

    I could only congratulate to author of this page for His Advanced Security Skills. :)

    Bye.

    Wow!!! Now there's a WTF.  I viewed sourcevon the page - didn't find my name listed -bummer.

  • bladder wart (unregistered) in reply to quadesh
    quadesh:

    Hi there!

    It's my first day as a member on the Daily WTF :).

    I've something to share with You all, but since I don't have enough permissions to start a new thread I'll post it here.

    Visit http://www.kppd.pl/Dokumenty_KPPD/haslo.htm.

    It's not in English but when You will have a look on the source code of the page, You will definitely find it amusing. :) WTF?!

    I could only congratulate to author of this page for His Advanced Security Skills. :)

    Bye.

    Wow!  Just look at all that redundant code, failure to use functions is indeed a major WTF. :)

  • (cs) in reply to Martin

    I am pretty sure the problem is that, just as in elevators, they don't want the doors shutting on someone, trapping a leg or other part of the body.  So the "yardstick injection attack" simulated someone trapped inside the door.

    I agree. This is why there hasn't been much progress in secure egress beyond RFID+pin entry, exit crashbars, sweeps, and pneumatic closers. Nothing else is worth considering, aside from vault doors or man traps/checkpoints.

    All this fancy crap with automatic openers and hydralics and stuff can add an extra safety dimension which can be subverted to gain illegal access.

     And of course, none of the secure stuff is sexy. It's boring, but it works.
     

  • (cs) in reply to Dazed
    Dazed:

    Of course if real security is needed you have single-person airlocks under the nose of a security guard,

    So, if they fail authorization, they're ejected into the vacuum of space?
     

  • (cs) in reply to Otto
    Otto:

    All secure doors I've seen/used work in one of two ways. Either you need the ID to go in *and* out,

    I hate those things.  A previous company used these at a site I would often visit, and I'd be stuck inside the stairwells with no way out at times.  Though the bottom floor did let you exit the stairwell itself.  But if you were inside the work area, you could not even get to the stairwells if your keyboard didn't work.  And being a visitor, the key would sometimes expire on me.  Rumor has it that doors would allow exit if a fire was detected, but it still felt like a trap.

    One Friday night I got stuck in a catch-22.  I wanted to drop off my keycard at the reception desk because it was my last day, but I needed the keycard to get out of the lobby.  So I had to wait until someone else left the building (given that this site was in Europe, there were few people working late).  To add insult to injury, as soon as I got out it started raining, and the lobby exit was as far as possible from the train stop at the rear of the site.

    I never understood the need to prevent people from leaving.  If it's to prevent exploits to allow entering there are easy alternatives, as described.

  • (cs) in reply to SeeJay

    Anonymous:
    I work for a bank and our latest gift was a Swiss army knife with the bank logo engraved on it.  Giggidy.

    There are some places of employment where you do not want to hand out knives to the workers.

  • Zylon (unregistered) in reply to its me

    its me:
    Just what are the chances someone doesn't know what a yardstick is, but knows how long a yard is? That's like saying a mile is a mile long.... Very correct, also very useless...

    Fair enough, but neglecting to mention that the "yard" in yardstick is a unit of measurement was bizarre, and possibly gave the impression that "yard" is being used here in one of its other, non-length-related senses. Saying that a yard*stick* is approx a meter is only tangentially correct. Best answer would have been, "A yardstick is a measuring device usually one yard in length. A yard is approximately a meter."

  • Olddog (unregistered) in reply to hk0
    hk0:

    I am pretty sure the problem is that, just as in elevators, they don't want the doors shutting on someone, trapping a leg or other part of the body.  So the "yardstick injection attack" simulated someone trapped inside the door.

    I agree. This is why there hasn't been much progress in secure egress beyond RFID+pin entry, exit crashbars, sweeps, and pneumatic closers. Nothing else is worth considering, aside from vault doors or man traps/checkpoints.

    All this fancy crap with automatic openers and hydralics and stuff can add an extra safety dimension which can be subverted to gain illegal access.

     And of course, none of the secure stuff is sexy. It's boring, but it works.
     

    Consider this.  One-way in, One-way out. Two different doors. Front door-Back door. One door is for entry only( entrance security enforced, no exit allowed ).  The other door is for exit only ( no entry allowed ). Once you're in ( front door ), you can get out ( back door ).

  • (cs) in reply to Olddog
    Anonymous:
    hk0:

    I am pretty sure the problem is that, just as in elevators, they don't want the doors shutting on someone, trapping a leg or other part of the body.  So the "yardstick injection attack" simulated someone trapped inside the door.

    I agree. This is why there hasn't been much progress in secure egress beyond RFID+pin entry, exit crashbars, sweeps, and pneumatic closers. Nothing else is worth considering, aside from vault doors or man traps/checkpoints.

    All this fancy crap with automatic openers and hydralics and stuff can add an extra safety dimension which can be subverted to gain illegal access.

     And of course, none of the secure stuff is sexy. It's boring, but it works.
     

    Consider this.  One-way in, One-way out. Two different doors. Front door-Back door. One door is for entry only( entrance security enforced, no exit allowed ).  The other door is for exit only ( no entry allowed ). Once you're in ( front door ), you can get out ( back door ).

    Still not enterprisey enough IMHO. 

  • poprocks (unregistered) in reply to GrandmasterB
    Anonymous:
    What is a yardstick?  I've only heard the word used in a metaphorical sense before.

    Its basically a 3 foot long measuring stick (approx a meter long).   Type 'folding yardstick' into google images for a picture.

    It's a stick that's a yard long. Useful for measuring things by the yard.

  • poprocks (unregistered) in reply to GrandmasterB
    Anonymous:
    What is a yardstick?  I've only heard the word used in a metaphorical sense before.

    It's a stick that's a yard long. Useful for measuring things by the yard.

  • dustin (unregistered)

    WTF wheres the xml. This isn't enterprisey enough for me. They need to add a cluster of biztalk servers to the door.

    captcha: photogenic which I'm not because I'm ugly as hell. lol

  • Marc (unregistered) in reply to quadesh

    quadesh:
    I could only congratulate to author of this page for His Advanced Security Skills. :)

    Oh dear. My translation skills aren't up to much... *please* tell me that this translates as a "don't do this" page? Please! I'd even be glad for this to be an ironic honeypot... but!!!

  • Scoldog (unregistered) in reply to GoatCheez

    We need a super limbo champion for that.  Someone like Hermes Conrad!

  • Olddog (unregistered) in reply to Zylon
    Anonymous:

    its me:
    Just what are the chances someone doesn't know what a yardstick is, but knows how long a yard is? That's like saying a mile is a mile long.... Very correct, also very useless...

    Fair enough, but neglecting to mention that the "yard" in yardstick is a unit of measurement was bizarre, and possibly gave the impression that "yard" is being used here in one of its other, non-length-related senses. Saying that a yard*stick* is approx a meter is only tangentially correct. Best answer would have been, "A yardstick is a measuring device usually one yard in length. A yard is approximately a meter."

    I'm looking thru the window at the sticks in my yard...and thinking that I need pick them up.

    I'll use the yard tractor, it has a yard arm attachment. I'll use a yard tape to bundle them together.

    Some of them are only foot sticks, no longer than a ruler. I could ignore them, but they are never the less, yard sticks, and need to be yarded-up.

  • wyz (unregistered) in reply to darin
    darin:

    Anonymous:
    I work for a bank and our latest gift was a Swiss army knife with the bank logo engraved on it.  Giggidy.

    There are some places of employment where you do not want to hand out knives to the workers.

    ... or to the customer! 

    Bank Teller: Sir, here's your free knife.

    Customer: Thank you. I have a knife, put the money...

    Captcha: batman  ... he arrived just in time!

  • Krenn (unregistered) in reply to darin

    <i>I never understood the need to prevent people from leaving.  If it's to prevent exploits to allow entering there are easy alternatives, as described.</i>

    I've understood the intent to be a roster of who's still in the building in an emergency... except, of course, the security doors all open up in an emergency and you no longer swipe your way out, so you're not recorded as leaving.... 

  • JL (unregistered) in reply to Zylon
    Anonymous:

    its me:
    Just what are the chances someone doesn't know what a yardstick is, but knows how long a yard is? That's like saying a mile is a mile long.... Very correct, also very useless...

    Fair enough, but neglecting to mention that the "yard" in yardstick is a unit of measurement was bizarre, and possibly gave the impression that "yard" is being used here in one of its other, non-length-related senses. Saying that a yard*stick* is approx a meter is only tangentially correct. Best answer would have been, "A yardstick is a measuring device usually one yard in length. A yard is approximately a meter."

    To his credit, the guy also said that the yardstick was three feet in length (in addition to saying it was approx. one meter), which is both exactly correct and more likely to be understandable by non-Americans. 

  • JL (unregistered) in reply to dustin
    Anonymous:

     Why is a bank handing out yardsticks? Shouldn't they be handing out something people that work at a bank can actually use like pencils and pens?

    How else are they going to measure out their gigantic novelty checks? 

  • chuck (unregistered) in reply to Zylon
    Anonymous:

    its me:
    Just what are the chances someone doesn't know what a yardstick is, but knows how long a yard is? That's like saying a mile is a mile long.... Very correct, also very useless...

    Fair enough, but neglecting to mention that the "yard" in yardstick is a unit of measurement was bizarre, and possibly gave the impression that "yard" is being used here in one of its other, non-length-related senses. Saying that a yard*stick* is approx a meter is only tangentially correct. Best answer would have been, "A yardstick is a measuring device usually one yard in length. A yard is approximately a meter."

    I do believe you can find a good example of a yardstick if you pulled out the one that's currently residing up your ass.

  • (cs) in reply to CynicalTyler
    Anonymous:
    jtwine:
    I once found myself on the wrong side of a secure door at a previous job without my badge (badge was on my desk) during an all-nighter.  I was able to find a ruler and sheets of paper in an unsecured office and tried pushing them through the space between the door trying to trigger the RTE (Request To Exit) sensor.

    This did not work for me because the RTE sensor was a PIR (Passive InfraRed) sensor.  PIRs tend to be tuned to the particular infrared wavelength of the target, in this case a human.  That is why I was unable to trip the sensor using the paper or ruler, and had to get security to get me back in (an hour or two later).

    Then what you're supposed to do is heat an unsecured pot of coffee to 98 degrees F and spray it under the door via straw.
     

     

    java hack?

  • (cs) in reply to Martin
    Anonymous:

    There seems to be an assumption that the door was opened because there is motion detection on the far side to allow easy exits.  I doubt that is the case.  I am pretty sure the problem is that, just as in elevators, they don't want the doors shutting on someone, trapping a leg or other part of the body.  So the "yardstick injection attack" simulated someone trapped inside the door.

    Except one could have that part of the door system shut off when the door is in the "fully closed" position. Also, most elevators I've seen don't have a detection stream that reopens the door right away, but simply reverses the motor (electric, pneumatic, hydraulic, or otherwise) if there is sufficient strain (such as that of a person in the way), meaning it isn't enough to just put your hand in the door - you have to actually push the doors open to trigger that. If these doors were similar, you'd have to push around with the yardstick to trigger it, and quite likely the yardstick would break before that happened.

  • (cs) in reply to Zylon
    Anonymous:

    its me:
    Just what are the chances someone doesn't know what a yardstick is, but knows how long a yard is? That's like saying a mile is a mile long.... Very correct, also very useless...

    Fair enough, but neglecting to mention that the "yard" in yardstick is a unit of measurement was bizarre, and possibly gave the impression that "yard" is being used here in one of its other, non-length-related senses. Saying that a yard*stick* is approx a meter is only tangentially correct. Best answer would have been, "A yardstick is a measuring device usually one yard in length. A yard is approximately a meter."

    Gosh, I was getting pretty clear on the concept, but now I'm all confused again.  A yardstick is usually one yard in length?  I don't understand... under what circumstances is it not a yard in length?  And if it can be different lengths, then why is it called a yardstick?

    (As long as you're going to get all nitpicky about an accurate and perfectly acceptable answer, I'm going to hold you to it.)
     

  • mnature (unregistered) in reply to Olddog
    Anonymous:
    hk0:

    I am pretty sure the problem is that, just as in elevators, they don't want the doors shutting on someone, trapping a leg or other part of the body.  So the "yardstick injection attack" simulated someone trapped inside the door.

    I agree. This is why there hasn't been much progress in secure egress beyond RFID+pin entry, exit crashbars, sweeps, and pneumatic closers. Nothing else is worth considering, aside from vault doors or man traps/checkpoints.

    All this fancy crap with automatic openers and hydralics and stuff can add an extra safety dimension which can be subverted to gain illegal access.

     And of course, none of the secure stuff is sexy. It's boring, but it works.
     

    Consider this.  One-way in, One-way out. Two different doors. Front door-Back door. One door is for entry only( entrance security enforced, no exit allowed ).  The other door is for exit only ( no entry allowed ). Once you're in ( front door ), you can get out ( back door ).

    Have to allow exits out of the entry only door, in case of emergencies.  There could be a fire between you and the exit only door.  The way to do that is have all manner of alarms go off if that happens, with armed security arriving within seconds.  Safety first.

    Of course, the simple answer would then be to have halon fire suppression installed . . .

  • woohoo (unregistered) in reply to darin
    darin:
    To add insult to injury, as soon as I got out it started raining, and the lobby exit was as far as possible from the train stop at the rear of the site.

    This wouldn't by chance be a building of a well-known german company in vienna/austria?

    captcha: perfection ... oh come off it, I'm going to blush...;o)

  • Olddog (unregistered) in reply to mnature
    Anonymous:
    Anonymous:
    hk0:

    I am pretty sure the problem is that, just as in elevators, they don't want the doors shutting on someone, trapping a leg or other part of the body.  So the "yardstick injection attack" simulated someone trapped inside the door.

    I agree. This is why there hasn't been much progress in secure egress beyond RFID+pin entry, exit crashbars, sweeps, and pneumatic closers. Nothing else is worth considering, aside from vault doors or man traps/checkpoints.

    All this fancy crap with automatic openers and hydralics and stuff can add an extra safety dimension which can be subverted to gain illegal access.

     And of course, none of the secure stuff is sexy. It's boring, but it works.
     

    Consider this.  One-way in, One-way out. Two different doors. Front door-Back door. One door is for entry only( entrance security enforced, no exit allowed ).  The other door is for exit only ( no entry allowed ). Once you're in ( front door ), you can get out ( back door ).

    Have to allow exits out of the entry only door, in case of emergencies.  There could be a fire between you and the exit only door.  The way to do that is have all manner of alarms go off if that happens, with armed security arriving within seconds.  Safety first.

    Of course, the simple answer would then be to have halon fire suppression installed . . .

    Good point. Change that to one way in, 10 ways out. What are the odds?

  • (cs) in reply to wyz
    Anonymous:

    Bank Teller: Sir, here's your free knife.

    Customer: Thank you. I have a knife, put the money...

    Captcha: batman  ... he arrived just in time!

    Hee hee hee!  No bank would do that!  Give out a free knife or a free gun for opening an account!

    http://www.imdb.com/gallery/ss/0310793/Ss/0310793/bowling_for_columbine_15.jpg?path=gallery&path_key=0310793

      

  • woohoo (unregistered) in reply to marvin_rabbit
    marvin_rabbit:

    Gosh, I was getting pretty clear on the concept, but now I'm all confused again.  A yardstick is usually one yard in length?  I don't understand... under what circumstances is it not a yard in length?  And if it can be different lengths, then why is it called a yardstick?

    well, no.... in german speaking countries, (foldable) yardsticks are often called "zollstock" (especially by elder people). "stock" means of course "stick", and one "zoll" (~2.54 cm) is nearly exactly the same as one inch. now, firstly, "zoll" is an old measure that is not in use anymore, because we've been using the metric system for quite a long time. and secondly, even if it was still in use, the stick (whether foldable or not) is certainly not exactly one "zoll" i.e. inch long. so, "yardstick" does not literally mean "stick exactly one yard in length", it just means "stick used for distance measurements with markings in inch/yards on it". imagine this device being called "centimeterstick", would you then assume it is precisely one centimeter long? many do say "zentimetermass" or "metermass" instead of "zollstock" in german, which literally translates to "centimeter -" or "meter measure" respectively. I've very seldom seen one of these to be exactly one meter long (though this is sometimes used by taylors), and never ever one centimeter long. see? you're taking it waaay to literal... ;o)

    captcha: perfection .... for the 2nd time today, I'm really going to blush...;o)

  • Pig Hogger (unregistered) in reply to CynicalTyler

    Anonymous:
    jtwine:
    PIRs tend to be tuned to the particular infrared wavelength of the target, in this case a human.
    Then what you're supposed to do is heat an unsecured pot of coffee to 98 degrees F and spray it under the door via straw.

    Which is easy, because everyone keeps a pot of coffee at body temperature and straws in corridor outside of secured areas…

    Oh, wait, we DO have a supply of liquid  at body temperature, and a straw handy: let’s just piss under the door, that’ll do the trick!

     Captcha: "hacker".
     

  • (cs) in reply to marvin_rabbit
    marvin_rabbit:

    Gosh, I was getting pretty clear on the concept, but now I'm all confused again.  A yardstick is usually one yard in length?  I don't understand... under what circumstances is it not a yard in length?  And if it can be different lengths, then why is it called a yardstick?

    (As long as you're going to get all nitpicky about an accurate and perfectly acceptable answer, I'm going to hold you to it.)

    I have a yardstick that's about 40 inches long.... One side is a yardstick, the other is a meter-stick...

    -Me 

  • Peter (unregistered) in reply to its me

    This reminds me of when we had asked security to install a lock on a door so we could restrict access to the area where we stored our spare PC's and associated parts for repairs.  Sure enough, came back the next day and the lock was on the door.  The problem is that the keyhole was on the side with the equipment.  I laughed quite a bit when I saw that.  I still don't know what they were thinking - maybe that if someone got in they couldn't get out (except by the large double-doors that were locked from the inside as one normally expects).

     -Pete
     

  • Olddog (unregistered) in reply to its me
    its me:
    marvin_rabbit:

    Gosh, I was getting pretty clear on the concept, but now I'm all confused again.  A yardstick is usually one yard in length?  I don't understand... under what circumstances is it not a yard in length?  And if it can be different lengths, then why is it called a yardstick?

    (As long as you're going to get all nitpicky about an accurate and perfectly acceptable answer, I'm going to hold you to it.)

    I have a yardstick that's about 40 inches long.... One side is a yardstick, the other is a meter-stick...

    -Me 

    Born in the upper midwest where yardsticks are still in use,  primarily to measure snowfall or poke at the cans on the top shelf of the pantry... the yardstick is not a thing to ponder. Obviously someone had enough sense to lengthen the yardstick so as to allow for those British Inches (metric system). This leaves us with a roughly 39 inch yardstick. That gives a nice 3 inch gap on the American side of the stick - suitable for advertisment. Need I say more?

  • lihtox (unregistered) in reply to marvin_rabbit

    A yardstick is usually one yard in length?  I don't understand... under what circumstances is it not a yard in length?

     
    Americans might use "yardstick" to refer to a meter stick, which of course is a little longer than a yard.
     

  • jkndrkn (unregistered) in reply to 4tehwin!!!

    me2

  • (cs) in reply to aquanight
    aquanight:

    Also, most elevators I've seen don't have a detection stream that reopens the door right away, but simply reverses the motor (electric, pneumatic, hydraulic, or otherwise) if there is sufficient strain (such as that of a person in the way), meaning it isn't enough to just put your hand in the door - you have to actually push the doors open to trigger that. If these doors were similar, you'd have to push around with the yardstick to trigger it, and quite likely the yardstick would break before that happened.

    I've seen many that don't need any pressure, or indeed contact, in which you can make the closing doors open by merely waving your arm in the doorway.  I've also seen one which used (I guess) a near infrared LED on one side and a sensor on the other, for which we created a DIY "unmanned door hold" feature for when we were loading goods into the lift - this consisted of a post-it note with "door hold" written on it which was placed over the LED (visible as a small hole in the edge of the door) when we needed to keep the door open :-)

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