The microscope and its revelations . every such case, a black back-ground must be provided, of LIEBEEKtJHN.—STAGE-FOECEPS. 143 such a size as to fill the field, so that no light shall come tothe eye direct from the raiiror, and yet not large enough tocreate any unnecessary obstruction to the passage of the tsl^sfrom the mirror to the speculum. With each Lieberkuhn iscommonly provided a blackened stop of appropriate size, havinga TveU-Hke cavity, and mounted upon a pin which fits into asupport connected with the under side of the stage; but thoughthe dark well serves to thro
The microscope and its revelations . every such case, a black back-ground must be provided, of LIEBEEKtJHN.—STAGE-FOECEPS. 143 such a size as to fill the field, so that no light shall come tothe eye direct from the raiiror, and yet not large enough tocreate any unnecessary obstruction to the passage of the tsl^sfrom the mirror to the speculum. With each Lieberkuhn iscommonly provided a blackened stop of appropriate size, havinga TveU-Hke cavity, and mounted upon a pin which fits into asupport connected with the under side of the stage; but thoughthe dark well serves to throw-out a few objects with peculiarforce, yet, for aU ordinary purposes, a spot made with blackpaper or black seahng-wax-varnish upon a sKp of glass vdUanswer the requiied pm-pose very effectually, the slip beingsimply laid upon the stage beneath the object. Section 2. Apparatus for the Presentation of Objects. 66. Stage-Forceps.—Every Microscope should be furnishedwith a pail of Stage-forceps (Eig. 47) for holding minute Pig. Stage-Forceps. objects beneath the object-glass. They are mounted by meansof a joint upon a pin, whieh fits into a hole either in thecomer of the stage itself or in the object-platform; the objectis inserted by pressing the pin that projects from one of theblades, whereby it is separated from the other; and the bladesclose agaiu, so as to retain the object when the pressure iswithdrawn. By sLidiug the wh-e-stem which bears the forcepsthrough its socket, and by moving that socket vertically uponits joiut, and the joint horizontally upon the pin, the objectmay be brought into the field precisely in. the position re-quired ; and it may be turned round and round, so that aUsides of it may be examined, by simply giving a twistingmovement to the wire stem. The other extremity of the stemoften bears a small brass box filled with cork, and perforatedwith holes in its side; this affords a secure hold to cormnonpins, to which disks of card, &, may be atta
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Keywords: ., bookcentury1800, booksubjectmicroscopes, booksubjectmicroscopy
