Court of Appeals for the Seventh Circuit October 5, 1909, No. 1,503 (Dieckmann v. Milwaukee Corrugating Co.)

GROSSCUP, Circuit Judge,

after stating- the facts as above, delivered the opinion.

The elbow, as an article of manufacture, is corrugated longitudinally; the function of the corrugation being- to afford expansibility to the pipe under pressure of changing cold and heat in its contents; and is crimped on its inner side, the function of the crimp being merely to *151take up the metal in the