Rare draftsmen's protractor manufactured by the Melbourne firm of Brush and Drummond. The firm evolved into the manufacturing jeweller Drummond and Co. but had its origin in the partnership of Samuel Brush and William Drummond which began in 1872. Brush died in 1878 and the firm some time later changed its name to Drummond and Co.This protractor is clearly marked and would date to shortly after the death of Brush.
It has an interesting association in that it is marked "A W. CROOKE". Angas Warren Crooke, b. 1854, became the Officer-in-Charge of the Victorian Crown Lands and Survey Office.
Additional military "Broad Arrow" mark and the stamped number 71.