A 6 single arm protractor by Robson, Newcastle on Tyne
A brass single arm, 6 protractor signed on the vernier arm,'F. 46 Dean St, Newcastle on Tyne. Robson & Co on Dean Street in1867.
A brass single arm, 6 protractor signed on the vernier arm,'F. 46 Dean St, Newcastle on Tyne. Robson & Co on Dean Street in1867.