Improvements relating to steam and water pipes for bakers' ovens and other heating apparatus

摘要

309,753. Talbot-Stead Tube Co., Ltd., and Mellor, A. H. May 4, 1928. Bakers' ovens.-The furnace end a of a Perkins' tube is formed internally and externally of smaller diameter than the remainder, and the reduced portion is surrounded by a reinforcing sleeve b, which may be made of chromium or chromium-nickel steel.