A detailed look.

ACME Steam Outboard a. cylinder oil lubricator needle valve b. hydrostatic lubricator (for injecting steam cylinder oil into the steam) c. feedwater pump bypass valve d. hand feedwater pump e. this hand screw restricts the ball lift on the hand pump f. whistle isolation valve (whistle not installed in this picture) g. inlet cam case h. throttle valve handwheel i. cylinder drain valve j. exhaust vale spring k. cylinder m. arrow tip on draft door (fire door is above)