When the progress engines were introduced in the 1920/30s there were 4 engines, a horizontal and a vertical oscillator, and a horizontal and a vertical slide valve engine. There is a vertical slide valve Progress in my mates little museum. This is as found, I tidied it up a bit and did a bit of repair, a nice wee engine, about 90 year old.
Ian S C
Edited By Ian S C on 24/10/2018 13:28:40