THE light metals have come to be used so widely wherever it is desirable to keep the weight of parts down that it seems necessary to review the advantages of the old standby - steel.
This task is carried out here by Mr. Strothman, who gives several examples of parts that were not only stronger and more easily fabricated when made of steel but were actually a little lighter.
It does not follow that steel should replace these other metals in every case. It means, rather, that when a part is being designed, all possible materials should be considered, particular consideration being given to the ratio of strength to weight and the modulus of elasticity of each material.