A brass and steel precision level with clinometer by Cooke Troughton & Simms of York, England, circa 1925.

Level scale marked: 1 DIV = 1 IN 10000

Clinometer scale marked: 1 DIV – 3 IN 1000 (1 DIV = 10 MINS ANGLE.)

End plate marked: MADE BY COOKE TROUGHTON & SIMMS AT YORK. ENGLAND. E.O.95255

Length: 21 cm.

In fitted case: 26 x 9 x 11 cm.

Cooke, Troughton & Simms, Buckingham Works, York, was a British instrument making firm formed in 1922 by the merger of T. Cooke & Sons and Troughton & Simms.

Literature: Instrument Makers to the World: History of Cook, Troughton and Simms, 1992, Anita McConnell.