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'Sitesquare' optical square, British, 1959

1959

Automatic building level, British, 1957

1957

Microptic transit theodolite, 1954

1950-1954

Autoset surveying level, prototype, with case by Hilger & Watts Ltd, Debden, Essex, England,1957

'Autoset' Surveying Level, prototype, with case, 1957

1957

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