United States. Army. Signal Corps · Washington · leaf 40
fore being bent it will have the following appearance: You see that the top line, the bottom line, and the center line are all of the same length. Now we will bend it right round in a circle, thus The center line is still the same length as it was before being bent, but you will note that the top… … Fig. 18. on the inside of the circle which before being bent was the same length as the center line must now be shorter because it is nearest to the center of the circle. That can only be due to the strain of crushing. That can only be produced by a state of compression. So you see that the wood…
Aeronautics, Military
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
