The parts of light microscope are being discussed in this article. The parts of the light microscope are the following:

The magnifier, which is lodged in a cavity formed partly by the cap, and by the silver cup or speculum, which is a quarter of an inch thick at its edge, and whose focus is about half an inch; in front of this again there is a disk of metal, three-eights of an inch in diameter, connected by a wire with a small knob; upon this disk the injected object is fastened, and is covered over with some kind of varnish which has dried of a hemispherical figure.

Between this knob and the inside and outside of the tube there are two slips of thin brass, which act as springs to keep the wire and disk steady. When the knob is moved, the injected object is carried to or from the lens, so as to be in its focus, and to be seen distinctly, whilst the condensing lens serves to concentrate the light on the speculum. To the lower part of the tube a handle of ebony, about three inches in length, is attached by a brass ferrule and two screws.

The use of this instrument is obvious: it is held in the hand in such a position that the rays of light from a lamp or white cloud may fall on the condenser, by which they are concentrated on the speculum; this, again, further condenses them on the object and the disk, which object, when so illuminated, can readily be adjusted by the little knob, so as to be in the focus of the small magnifier.