Microscopic illustrations of few new, popular and diverting living objects with their natural history, &c. &c. : conjoined with accurate descriptions of the latest improvements in the new microscopes ... / by C.R. Goring and Andrew Pritchard.

  • Q55972295
Date:
1830
Catalogue details

Licence: Public Domain Mark

Credit: Microscopic illustrations of few new, popular and diverting living objects with their natural history, &c. &c. : conjoined with accurate descriptions of the latest improvements in the new microscopes ... / by C.R. Goring and Andrew Pritchard. Source: Wellcome Collection.

    102/114 page 86
    S6 brightness cannot otherwise be attained). The object must alzcays be held by the nippers, or mounted on a cork cylinder, when it is to be illuminated by cups: when the nippers only are employed the disk, V, must be placed be- tween them and the illuminating lens, &c. so as to prevent any false light from getting into the object-glass, and also to furnish a black ground. Remove the bottom of the black box, 'p, and fix the con- denser, n, in such a position, by means of its tightening screw, that its convexity shall be inserted into the bottom of the said black box, which will be found its best position either for day-light or candle-light. The engiscope must then be placed on the tripod stand (mounting No. I,) and directed against the sky, (the best way, perhaps, of using the cups with day-light), or it may be used in an horizon- tal or vertical position, and the light reflected by the oval mirror; but when artificial light is preferred, use the mounting. No. 2, and place an Argand lamp about an inch and a half from the condenser, n, taking care that its flame is concentric with it, and a most intense illumination will be procured, even with powers equal to the l-60th of an inch focus. Cups, when properly managed, give a brighter light than can be procured by any other means*. Please to remember that the condenser under the stage, and that represented attached to the body, are expressly and exclusively devoted to opaque objects. * The cups may be used without the assistance of the condenser, but, of course, in this way give a much more feeble light.
    No text description is available for this image
    No text description is available for this image
    No text description is available for this image