[Drawing] No. 3 Unit, Intermediate Compressor. Sectional arrangement of two stage three crank gas compressor / Peter Brotherhood Ltd. [1920s. Xerox copy of line drawing, scales 3/4":1' (reduced to 1/2":1'); 1 1/2":1' (reduced). Built for Messrs. Synthetic Ammonia & Nitrates Ltd. See also ARCH : BROTH for a collection of over 60 drawings of this compressor, and MSL 431]