Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 321
Fig. 141. Fig. 142. sectional area of the lower flange, which is subjected to tension, is six timesthat of the upper one, which has to resist compression, because the strengthof cast iron to resist pressure is about six times greater than its power- ofresisting a pull. If the upper flange were made…
Inventions
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