Solar microscope by Dollond, 1/4 19th C.

 

Signed: DOLLOND LONDON

Plate 11,8 x 11,8 cm

Box 30,5 x 15,5 x 7 cm

The square plate can be fixed to a window shutter by two screws. The mirror movement can be controlled by two wing nuts; one attached to a pinion for angle variation and the other to a worm screw for rotation. The body tube attaches to the plate and a condensing lens is present; at the other end a spring-barrel tube holds the final condenser, the specimen and the projection lens.
Six projections lenses are present, with numbers from 1 to 6 engraved on the brass rims. The final condensers are contained in dovetail slides and are marked for their appropriate projector lens in pair: 1 & 2, 3 & 4, 5 & 6. Focusing is by rackwork. There is also a white ivory talc box. The microscope packs into a mahogany box.