comprising of a large brass 'diagonal scale' signed 'STANLEY LONDON' in a fitted French polished mahogany case, the scale engraved with 24 inches along the top edge, case length 80cm, the case with a brass label for D.S.I.R. - Department of Scientific and Industrial Research, was a department of the British Government responsible for the organisation, development, and encouragement of scientific and industrial research at the begining of the 20th Century; a large German set of nickel plated scale rules in a fitted wooden case with a plaque for 'GEBR WICHMANN BERLIN N.W.6, KARLSTR 13', case length 60cm; and an 18" rolling rule in a French polished mahogany case (x3)