TRIPOD MAGNIFIER
The tripod magnifier (Fig. 1) is a simple lens mounted on a mechanical stand. The tripod is placed over the object and the focus is obtained by means of a screw which raises or lowers the lens, according to the degree it is magnified.
WATCHMAKER’S LOUPE
The watchmaker’s loupe (Fig. 2) is a one-lens magnifier mounted on an ebony or metallic tapering rim, which can be placed over the eye and held in position by frowning or contracting the eyelid.
Fig. 1.—Tripod Magnifier Fig. 2.—Watchmaker’s Loupe
FOLDING MAGNIFIER
The folding magnifier (Fig. 3) of one or more lenses is mounted in such a way that, when not in use, the lenses fold up like the blade of a knife, and when so folded are effectively protected from abrasion by the upper and lower surfaces of the folder.
Fig. 3.—Folding Magnifier Fig. 4.—Reading Glass