[Drawings (c.64) of a vertical reciprocating gas compressor (3 crank, 2 stage), capable of compressing 1000 c.ft. of free mixed gases per minute to a pressure of 150 atmospheres, speed 200 rpm. / Peter Brotherhood Ltd. ca.1918. With copy sectional arrangement drawing of same showing 'new cylinders etc on existing understructure'; dated 1933, stapled to hardboard. Associated with actual gas compressor (inv. no. 1982-1494) in Museum's Industrial Chemistry Collection. See also MSL 333 and 431 for further compressor drawings]