Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 321
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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