Weather compendium combining cistern mercury barometer, alcohol thermometer and thread hygrometer by George Graham, Fleet Street, London, 1739 Weather compendium by George Graham Meteorology 1739
TCI Tachymat with recording attachment by Wild Heerbrugg A.G., Switzerland, c. 1977. The earliest form of total station. Part of Tachymat total surveying station, Swiss, 1972-1982 Surveying 1975-1979