Details
A lacquered-brass single-arm drawing protractor,
by E.R. Watts & Son, with magnifier in mahogany case 13¾in. (34.9cm.) wide; and a roller parallel rule, by W.H. Harling (2)
by E.R. Watts & Son, with magnifier in mahogany case 13¾in. (34.9cm.) wide; and a roller parallel rule, by W.H. Harling (2)