Circular Adder, by Newton & Co., London, Early 20th Century

Subject: Mathematical instruments
Item type: Object
Makers: Newton & Co.
Provenance: Presented by A. Vassall
Primary inscriptions: "The / British / Calculator / (Model B) / FOR COMPOUND ADDITION / PATENT" on upper face; "NEWTON & CO. / 3. FLEET STREET. LONDON / OPTICIANS / TO THE KING / AND / H.R.H. PRINCE OF WALES" inside case lid
Dimensions: Diameter: 133mm
Inventory No: 51725
Accession Number: 1938-?

Description

Circular adder for £sd with one white and one red stylus, in lined case (one edge of lid missing).