Thos Rubergall 27 Coventry St., London

Cary-Gould type pocket microscope, c. 1820

Thos Rubergall 27 Coventry St., London

Thos Rubergall 27 Coventry St., London

Thos Rubergale 27 Coventry St., London

Thomas Rubergall, mathematical, optical, and philosphical instrument maker, wsa active from 1802-1854 at various addresses in London. In 1802, he traded at 27 Piccadilly, Princes Street, Soho, in 1805-1823, he was located at 27 Coventry Street, and in 1826-1854, he was located at 24 Coventry Street, Haymarket.

The Gould type microscope is described and illustrated in the book Microscope Manipulation by George T. Fisher, 1845 as follows:

Gould type microscope

Gould's Microscope. A very convenient and powerful form of instrument is that which bears the above name. Its general form is as in the annexed diagram, and the whole fits into a mahogany box. In the centre of the lid of the box screws the upright square stem A, fig. 14. This has upon one side of it a rack movement, in which works the screw B, intended to raise or depress the stage C, as occasion requires. C consists of two plates of brass held together by a spring; between these plates the object slider D is placed. E is an arm at right angles to A; it is attached and confined by the screw at the end of it in A. F must be supposed to represent three lenses, or magnifiers, screwed together, the focus of each being such that they act in unison together. G is a reflector to cast the light upwards through the object to the eye. H is the main tube, which bears the eye-lens at one end, and screws upon one of the object lenses at the other.

When the instrument is in use, the focus is adjusted by moving the screw B, and the degree of magnifying power is according to the lenses, which are screwed on to the bottom of H. Thus, if one lens obtain an increase of 10, two lenses may obtain a power of 100, and three lenses of 1000. Let it be always remarked, that the more lenses the more obscure will be the image.

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