Slide Rules and Drawing Instruments, Stanley boxwood engineer's slide rule 'Ganga Ram's Patent Scale For Strains On Girders', devised by Sir Ganga Ram, CIE, MVO (1851-1927), circa 1890, with other boxwood scales (4), Treacher & Co, Bombay, two boxwood scales and two wooden protractors, in mahogany case (2), Newman & Co, Calcutta folding scale (1), drawing instrument cases (2), slide rule (1) and brass rolling rule (1), F-G
Slide Rules and Drawing Instruments, Stanley boxwood engineer's slide rule 'Ganga Ram's Patent Scale For Strains On Girders', devised by Sir Ganga Ram, CIE, MVO (1851-1927), circa 1890, with other boxwood scales (4), Treacher & Co, Bombay, two boxwood scales and two wooden protractors, in mahogany case (2), Newman & Co, Calcutta folding scale (1), drawing instrument cases (2), slide rule (1) and brass rolling rule (1), F-G
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