28th May 1929, Page 53
28th May 1929
Page 53, 28th May 1929Close
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......