Microptic alidade by Hilger & Watts Ltd, no.219565, HO 11, cased, in canvas carrying case, with tripod, Debden, Essex, England, 1956-1959 Microptic alidade, British, 1956-1959 1956-1959
Trigonometer (lacking level) by G.F. Brander of Augsburg, Germany with wooden case 1774-1774, (ex Zallinger collection). Trigonometer, 1760-1770 1760-1770
Sectioning surveying alidade with levelling staffs, staff, level and cases, serial No.20654 by Carl Zeiss Jena, Germany (supplied by Carl Zeiss (London) Ltd.), 1925-1935 Sectioning alidade, with scales, staff, level and cases, 1925-1929 1925-1929
Small universal instrument for surveying, unsigned, European, 1790-1810. Alidade surveying instrument, European, 1790-1810 1790-1810