Most underused word. ( new to me ).I'd quite like the Otto Gas engine by Crossley Bros. of Manchester
Twin 6ft 6" fly wheels and pushin out 40 - 50Hp
Bargain at £225 (apparently about £10k in todays money)..i'd still like one
Also the advert uses the word "appurtenance" I had to look that up !! https://en.wikipedia.org/wiki/Appurtenance
Maybe we should rename a slave cylinder as an appurtenance cylinder