Two steam locomotive indicators
Steam Locomotive Indicators, two Crosby Indicators in wooden case marked: "Crosby Steam Gage & Valve Co. Boston Pat'd Sept.2 1829". Used for measuring steam pressure in cylinders.
Steam Locomotive Indicators, two Crosby Indicators in wooden case marked: "Crosby Steam Gage & Valve Co. Boston Pat'd Sept.2 1829". Used for measuring steam pressure in cylinders.