Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: Fall Protection System - Loading

[Subject Prev][Subject Next][Thread Prev][Thread Next]
>The workers were going to tie-off to it.  Bad
>idea.  Just a small lateral force on a cable produced enormous end
>reactions.  Try it sometime.
Anyone who can remember clotheslines knows about this one. God knows how 
many times I tightened sagging clotheslines (plastic covered wire--not 
rope) for my mother. I pull it up tight one weekend and  after a few 
months of hanging wet sheets it'd drop 8-10 inches. I didn't dope out 
what was doing it 'til after I'd learned about free body diagrams. Once I 
saw video tape of a wrecker operator tipping an overturned (on its side) 
car back on its wheels just by securing the tow cable to a frame member, 
taking the slack out of the cable and giving the cable a sideways tug 
with one arm. The car rolled upright just slick as glass. 

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)