A GROUP OF FIVE FIELD SURVEY AND MILITARY INSTRUMENTS BY TROUGHTON & SIMMS, T. COOKE & SONS, NEGRETTI & ZAMBRA, AND OTHERS (5)

20th Century
Including a prismatic compass by Troughton & Simms, London, no. 5524, with leather case; a large brass surveyor’s compass by T. Cooke & Sons Ltd, London, York & Capetown, marked D.19; a field clinometer by Negretti & Zambra, London, with brass sighting tube and leather case; a compact optical "Sitesquare", marked Made in England, with fitted leather case; and a Watkin clinometer dated 1892, by L. Siemens Bros & Co, London, in the original shaped mahogany case, the largest 20.5cm wide