Physical description

No. of pieces: 2. Mould cast and machine made. Plastic coated, lacquered wood (body). Copper alloy and plastic coated key. Surface finish: lacquered.

Inscriptions & markings

Inscribed on top face along front edge: “TRUE OHMS/ RIGHT AT 15.7oC No 1907/ P.S WIRE” Inscribed on top face in the centre, along the back edge: “ELLIOTT BROs LONDON” Inscribed measurements on top face, clockwise from top number: “30,000, 40,000, 10,000, 20,000” Inscribed on left side face: “P” Inscribed on top face along right edge: “D”