A Free Wheel Under Service Conditions

How a De Lavaud Device Functions on a W. and G. Van Owned by a Well-known Furniture-removal Concern. TIURING the past few years free..L.1 wheel devices have been built into the......

A New Method Of Testing Case - Hardening.

U P to the present the most'.popular Methods of testing the hardness of metal have been by the use of the Brinell and-Herbert pendulum machines. j. new Process has been invented......