Beschreibung:

A very rare Hugh Powell brass compound microscope with the signature of Dollond, circa 1838 signed Dollond London , undated , the body tube attached by a short arm to the top of the hexagonal-section limb, arranged to swivel through 180° so that the collar on the opposite end can be used with a simple microscope objective, the limb with rack and pinion movement for focusing by means of two knurled wheels, behind the left-hand of these a rod attached for fine focusing, clamped in place by means of turning the knulred wheel at its end, the fully-adjustable mechanical stage ( see below ) supported on the limb with two curved brackets, with sub-stage diaphragm wheel with four apertures and a plano-concave sub-stage mirror on a quadrant arm and sliding sleeve mounting, the limb attached via compass joint to a telescopic pillar and flat tripod foot, the legs with bevelled edges, the front one signed Dollond London , with three numbered eye-pieces, six achromatic objectives in labelled cans, and other items ( see below ) in a maroon-lined drawer in the origianl wooden carrying case, the inside of the door with applied trade label for H. POWELL, 24, Clarendon St. Somers Town, Mathematical, Optical and Philosophical Instrument Maker. Achromatic object glasses, Doublets, Triplets, & every other modern IMPROVEMENT ON THE MICROSCOPE executed upon the shortest notice , the case with brass lock, escutcheon and key -- 18½in. (47cm.) high See Colour Illustrations