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Not sure this is the site to ask this question, but here it goes anyway:

The other day I saw an electricity cable hanging in an unusually wide curve. That got my attention and I looked out of the window to find out that that cable was in the process of installation by two guys on top of two very high apartment buildings about 70 meters away from each other. There were no cranes in vicinity, so naturally I started wondering how in the world they got one end of the cable to the other roof. It isn't likely that one guy just threw a cable's end to the other guy. How is this done in cities without the use of cranes?

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closed as off topic by ChrisF May 3 '13 at 7:37

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If there's a "how is technical stuff done in cities" SE site, please let me know so I could repost there :) –  user1306322 May 3 '13 at 1:41
    
Sorry but this is off topic for a site about do-it-yourself and home improvement. –  ChrisF May 3 '13 at 7:37
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1 Answer

up vote 0 down vote accepted

Highly possible that one guy used a bow to shoot an arrow tied to end of a ball of string. As the arrow flew to the position of the other guy the string feed smoothy off the ball. In no time the two fellows had a length of string between themselves.

If it was a windy day then one guy possibly launched a kite out into the breeze. By running the kite out a good length the second guy was able to catch the kite string in hand.

In any case with the string between them then a light weight rope is tied to one end and the other guy used the string to pull the rope across the gap. The light rope is then used to pull across a stout rope.

Now you can guess that the stout rope, being strong and durable, is used to pull the electrical cable across between the buildings!!

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Sounds legit! :D –  user1306322 May 3 '13 at 7:42
    
If it was my first day on this job, I would've gone with the crossbow and strings. It probably also would've been my last day, but still I would never forget that! –  user1306322 May 3 '13 at 7:48
    
A bow or slingshot is typically used for tree guys to get the ropes on limbs. Most of the time if a person can already reach the height, like a apartment roof, it is significantly easier to simply drop the lead line. The concept is similar to snaking a line, as all you need is access to both ends. –  Jason May 3 '13 at 19:56
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