Ramsbottom safety valve
nounEtymology Named after English mechanical engineer John Ramsbottom.
1
A kind of tamperproof safety valve for use on locomotives, consisting of two plug-type valves connected by a spring-laden pivoting arm.
- The boiler had a large dome over the firebox, inside the cab, surmounted by Ramsbottom safety valves.1951 April, “Notes and News: Locomotive Notes: London Midland Region”, in Railway Magazine, number 600, page 283: