. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. THE MICROSCOPE. 13 carrying at its free extremity a sliding wire, G, to one end of which was attached a pair of forceps, I I, and to the other a small disc of ivory, H, blackened on one side and white on the other; the arm was capable of being adjusted to or from the lens by means of a screw, C, having a nut with a milled head, D; the spring, E, served to keep the lens holder, A B, in contact with the nut; this form
. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. THE MICROSCOPE. 13 carrying at its free extremity a sliding wire, G, to one end of which was attached a pair of forceps, I I, and to the other a small disc of ivory, H, blackened on one side and white on the other; the arm was capable of being adjusted to or from the lens by means of a screw, C, having a nut with a milled head, D; the spring, E, served to keep the lens holder, A B, in contact with the nut; this form of in- strument is in use at the present day, and a modification of it was adopted by the celebrated Lieberkuhn about forty years afterwards. ' The wonderful discoveries of Leeuwenhoek made by the single microscope, gave to this kind of instrument an universal reputation, and we find, accordingly, that the compound form was laid aside for a time, and the pocket microscope of Mr. Wilson was in great demand. Upwards of thirty years, however, were suffered to elapse before any step was taken (in this country, at least) towards the improvement of this instrument; the compoimd mi- croscope, then in use, was the con- trivance of Mr. John Marshall, and, from its un- wieldy natiure, was very little em- ployed. It was. Fig. 10. however, the first of the compound kind made for sale in England, and is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ]
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
