Brass steam pressure indicator. Brass T-frame with vertical cylinders at the end of each limb of various heights. Each cylinder has multiple adjusting knobs. All have paper rolls at the top with a needle to create a graph. Below each roll is a piece of string with a metal hook attached at the end.
CROSBY STEAM GAGE & VALVE CO. / BOSTON. MASS. U.S.A. / PAT'D JULY 2 & SEP. 2-1879 / " APRIL 11 & SEP. 5-1882 / " APRIL 30-1895 Engraved
TRADE MARK / CROSBY Engraved
J. HOPKINSON & CO. / BRITANNIA WORKS / MUDDERSFIELD / 854 Engraved
T S McInnes and Company Limited. Indicator - Steam Pressure, 1966.172. The Museum of Transport and Technology (MOTAT).