L.Brown
You are correct the chamber length of guns was marked on English guns from 1925-1954.From 1904-1925 the allowable safe pressure established by the Proof House,s is recorded for 2 3/4 chambers at 3 I/4 tons & for 2 1/2 chambers 3 tons.
The English ton is 2240 lbs; hence the pressures I gave in my earlier post. These pressure were developed from lead crusher tests conducted at the proof House[A test that I have witnessed] hence the term LUP is often quoted to denote pressure acceptable.
For further reading See; Gough Thomas,s[G.T. Garwood, Chartered Engineer] second Gun Book, pages 141-144. This describes in detail the British crusher gauge test and confirms the pressures that I quoted. This article was first published in the British magazine, Shooting Times, 28 February 1970.
Last edited by Roy Hebbes; 06/24/13 04:12 PM.
