Quick do it yourself graphic example of above. Get a number of ceramic floor tiles or something similar. Put one down flat on the ground with a coin (or whatever) in each corner, put another one down, again with four coins and continue up to 120 high. Pick up the top 30 or 40 and drop them down on the rest.
See how high you have to lift them to break the bottom few.
Now try it with steel.
Gordon






























as high as you likeor or something