A LIST OF THE APPARATUS TO CULPEPER’S MICROSCOPE.
Five magnifiers, each fitted in a brass cell; one of these is seen screwed on at D. Six ivory sliders, _k_, five of them with objects; and a small ivory box, _m_, containing some spare talcs, and wires for them. A brass tube, N, to hold the concave speculum. A brass box, M, for the same speculum. A fish-pan, _c_. A set of glass tubes, _b_. A flat and a concave glass, both fitted to the stage. A brass cone, _g_, to exclude superfluous light; it applies at the under side of the stage, F. A brass box, _p_, with plane and concave glasses for living objects. A pair of forceps, _q_. A steel wire, _b_, with a pair of nippers at one end, a point at the other, and a small ivory cylinder, _h_, to fit on the pointed end of the nippers. A convex lens, E, moveable in a brass semicircle; this is affixed to a long brass pin, which fits into a hole, F, on the stage. The uses of the above apparatus have been sufficiently described in the preceding pages.
Screw one of the five cells, which contains a magnifying lens, to the end, D, of the body; place the slider _i_ or _k_, with the objects, between the plates of the slider-holder, K. Then, to attain distinct vision and a pleasing view of the object, adjust the sliding body to the focus of the lens you are using, by moving the upper part, C, gently up and down while you are looking at the object, and regulate the light by the concave mirror, I, below. The image of the objects in this microscope is seen in a field of view of about six inches in diameter; but, in the improved ones before described, it is from about twelve to fifteen inches.
For opake objects, two additional pieces must be used; the first is a cylindrical tube of brass, represented at N, which fits on the cylindrical snout above D of the body: the second piece is the concave speculum, L; this is to be screwed to the lower end of the aforesaid tube. The upper edge of this tube should be made to coincide with the line which has the same number affixed to it as the magnifier you are using; that is, if you are making use of the magnifier marked 5, slide the tube to the circular line on the tube above D, that is marked also with No. 5.