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Original Steam Indicator Instrument manufactured by Dreyer Rosenkranz & Droop of Hanover, Germany. Housed in original wooden box, this heavy, precision instrument was developed in the 1880's based on the American Tabor design and later Crosby Indicator design. Used to measure locomotive horsepower/drawbar output, original indicators were used as early as 1790 and attributed to James Watt. The instrument looks pretty well complete housing a pair of drums for recording, various springs and other fittings. The original makers plate is inside and a small oval brass plate 'Sulzer Bros Engineers Norfolk Street, London' is affixed to the outside lid. The accompanying Backtrack Magazine from May 2009 carries a comprehensive article on the use of machines of this type,

Category: 
Auction: July 2015 , Lot: 222
Sold for: £280
Original Steam Indicator Instrument Manufactured