Triple Expansion Model Engine on Steam 1 of 2

My Bolton 9 triple expansion model engine, which I must finish, because the build was started 4 years ago, is here running on the vertical boiler which I made earlier this year. The valve timing is slightly out causing some irregularity of motion. I am also getting used to a gimbal for my video camera. First of 2 videos. see johnsmachines.com for details of build, scrolling back to 2016-17.