Prince of Wales microscope, c 1755.
© Science Museum / Science & Society Picture Library
George Adams of Fleet Street, London, the maker of this microscope, and his son George (Junior) were leading microscope and instrument makers from 1735 to 1797. This microscope was formerly in the King George III Collection of scientific instruments, and is inscribed 'Invented and made by George Adams, in Fleet Street, Mathematical Instrument Maker to His Royal Highnes the Prince of Wales'. The limb is supported at its centre of gravity on trunnions; the microscope was probably the first to be supported in this way. The stage has micrometer screws registering in two directions at right angles. Coarse focusing adjustment is effected by sliding the bar carrying the body, and fine adjustment by means of a fine-threaded screw.