Encyclopædia britannica : or, A dictionary of arts, sciences, and miscellaneous literature : constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises or systems .. . aUapertures in the fides of the cafe. The eye in thiscafe is excluded from extra light; the aberration ofthe fuperiluous rays through the glades is cut off; andthe eye coincides more exaftly with the common axe^of the lenfes. A veiy ufeful and eafy kind of mierofcope (defcrUbed by Joblot, and which has been long in ufe), adapt* : ed chiefly for viewing, and confining at th^ f
Encyclopædia britannica : or, A dictionary of arts, sciences, and miscellaneous literature : constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises or systems .. . aUapertures in the fides of the cafe. The eye in thiscafe is excluded from extra light; the aberration ofthe fuperiluous rays through the glades is cut off; andthe eye coincides more exaftly with the common axe^of the lenfes. A veiy ufeful and eafy kind of mierofcope (defcrUbed by Joblot, and which has been long in ufe), adapt* : ed chiefly for viewing, and confining at th^ fame tipie, p|jtf any living infefts, fmall animals, &p. is ftiown at fig. A reprefents a glafs tube, about j| inches , and ? inches high, B, a cafe of brafs or wood,containing a Aiding tube, with two or three magnify*ing glaftes that may be ufed either feparately or In the infide, at the bottom, is a piece ofivory, black and white on oppofite fides, that ii removed, and admits a point to be fcrewed in«to the centre, The cap unfcrews at P, to admit th?placing ef the ebjett; tUe prpper dift8n«« ef the glaffei fron* Af r C K () S C O F E . -^. 7;^ ?Jale ( r^>t^^.-//6l^j, ?/^^r,,^/,^,- /.:. M I C [ 713 1 M I C Witrorcore from tlis ohjecl is regulated by pulling up or dovvn?? i the brafs tube E at top containing tlie eye-glalFes. Tliis microfcope is particularly arcful tbr cxliibitingthe well known caxiova ia>\t:l!0 imperinlls, vulijarly call-ed the tliamond beetle, to the greateft advantage ; forwiiieh, as well as for other objcdts, a glafs bottom,and a poliihed reflector at the top, are often applied, the light upon the oLjeA. In this cafe, theHand and brafs-bottom F, as Ihown in the figure, aretaken by unfcrewing. 9. ///• Lyonets Single AnatomualIiiJJe3ina ^ 9. reprcfents a curious and extremely ufeful mi-crolcope, invented by that gentleman for the pur-pofe of minute difre«
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Keywords: ., bookauthorgleiggeorge1753, bookauthormacfarquharcolinca17451793
