Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 321
ill hardly be perceptible, and it will inthis position support a weight whirh in its former one would have broken IRON BRIDGES. 279 it clown. There is in this case a neutral line, ^yj as before ; but as thepart which is most compressed or extended is now situated at a greaterdistance from the… … Fig. 140. increase the weight to be supported, and they may, for that reason, be re-moved with advantage, leaving only sufficient wood to connect the upperand lower portions rigidly together. The form of cast iron beams, Fig. 141,which were used for many purposes, depends upon these principles. The
Inventions
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