. The microscope and its revelations. designed in 1771 isfigured in the Adams • M icmgrapliia Illustrata, and is reproducedin fig. 111. In this Lnstrumenl Adams claims to have embodied a number ofimprovements on all previous constructions. He applied two eve-glasses at A, a third near 15, and a fourth in the conical part betweenB and C, by uhich he increased the Held of view and of light ; were at A and I., by which these lenses could be separatedmore or Less, but the probability is very great that these copied from the improvements of a like kind devised by and
. The microscope and its revelations. designed in 1771 isfigured in the Adams • M icmgrapliia Illustrata, and is reproducedin fig. 111. In this Lnstrumenl Adams claims to have embodied a number ofimprovements on all previous constructions. He applied two eve-glasses at A, a third near 15, and a fourth in the conical part betweenB and C, by uhich he increased the Held of view and of light ; were at A and I., by which these lenses could be separatedmore or Less, but the probability is very great that these copied from the improvements of a like kind devised by and described above. He also arranged the object-lenses, orbuttons, and /«. to be combined ; seven buttons were provided,erspecula | Lieberkiilmsj highly polished, each having ignitiei- adapted to the focus of its concavity, one of which isand the buttons could also be used with anyour of these specula by means of t lie adapter. //. -1/--- /. :. London, 1H55 8vo 1 THE VARIABLE MICROSCOPE George Adams oVf^> /•*,. 144 THE BISTOBY AND DEVELOPMENT OF THE MICROSCOPE The body-tube, A B C, with its arm, F (in which it screwed at/),;mr used unless the fine adjustment was first put out of actionby urn-lamping it. The stage and mirror were adjustable on the large ratchet-wheel controlled by the pinion-handle, 8, gave therequired inclination to the stem. Xos. I and 2 were ivory and glass sliders for objects, to beapplied in the spring-stage No. 3 fitting at T ; the hollow at K [No.:!] is to receive the glass tube No. 10. No. 4 was a diaphragm calleda cone, from its conical shape; this was invented by Baker in 1743,and was used in all microscopes up to about 1820, when the wheel ofdiaphragms was re-invented by Mons. Le Baill
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
