- Museum number
Compound microscope of Culpeper type; wood, brass and vellum; top portion: turned and moulded mahogany, topmost brass shutter; downward projecting thick vellum sleeve; internally threaded wood ring(broken in two); field lens; brass objective holder screwed into wood ring; bottom portion: vellum tube covered with green sharkskin with two brass shaped rims attached to turned wood ring supported by three curved brass feet, screwed to wood base; whole optical system adjustable; concave illuminating mirror pivoted in semi-circular holding ring mounted on base; various accessories in a drawer in the base: lens, glass slip and twenty slides; pyramidal wood case with hinged front door; trade card.
- Production date
Height: 425 millimetres (overall)
Length: 153 millimetres (square)
- Curator's comments
- Ward 1981
Top portion Turned and moulded mahogany, with topmost brass shutter, and downward projecting thick vellum sleeve, external diameter 57 mm, length 69 mm below the moulded mahogany top, green-covered, with an internally threaded wooden ring, now broken into two, at its bottom. The eyepiece is of focal length 43 mm, and a field lens, focal length 101 mm, is mounted 65 mm below it. The brass objective holder, length 90 mm, is screwed
into the wooden ring mentioned above; the distance from the field lens to the objective is then 180 mm. There is a choice of five objectives.
Bottom portion Vellum tube, length 82 mm, covered with green sharkskin and with two shaped brass rims; attached to its lower end is a turned wooden ring supported by three curved brass feet, length 68 mm, attached at their lower ends to the stage; the curved and shaped feet continue downwards and are screwed to the wooden base, which is carved and moulded in its upper portion.
The whole optical system is adjustable vertically by sliding one vellum tube within the other. The concave illuminating mirror (now cracked) is pivoted in a semicircular holding ring which is mounted on the base and which can itself be rotated about a vertical axis. In a drawer in the base are various accessories, including four
alternative objectives, a lens with a holder now broken in two, a glass slip with end broken off with three shallow recesses, and twenty slides (one broken). All but one of these are titled in Dutch and are copies of illustrations and engravings, one dated 1859. The exception is entitled 'crystals of carbonate of lime'.
The wooden case is of pyramidal form, with a hinged front door, and inside it is the trade card of Benjamin Martin at his shop near Crane Court, Fleet Street, listing many kinds of 'Philosophical Optical and Mathematical Instruments' made and sold by him. The wording is: All sorts of Philosophical Optical and Mathematical
Instruments many of which are of New Invention, madeand sold by
at his shop
near Crane Court in Fleet Street
Planetariums, Globes of any size, Airpumps, Barometers, Thermometers, Pocket Microscopes, Wilson's Microscopes, Solar Microscopes &c. Reflecting and Refracting Telescopes, Reading Glasses, Opera Glasses, Spectacles &c. Hadley's Quadrants, Cases of Instruments, Sectors, Sliding Rules &c. Artificial Magnets; any of which maybe sent safe to any part of England.
- On display (G1/wp168)
- Acquisition date
- Britain, Europe and Prehistory
- Registration number