12-1

Updated: June 9, 2025

Q. What is the composition of the brass used for engine bearings? A. The brass bearings of an engine are composed principally of copper and tin. A very good brass for steam engine bearings consists of old copper 112 lbs., tin 12-1/2 lbs., zinc 2 or 3 oz.; and if new tile copper be used, there should be 13 lbs. of tin instead of 12-1/2 lbs.

C.E. John Bourne - A Catechism of the Steam Engine