4 HISTOLOGY OF MEDICINAL PLANTS 



FORMS OF SIMPLE MICROSCOPES 



TRIPOD MAGNIFIER 



The tripod magnifier (Fig. i) 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 



FIG. i. Tripod Magnifier FIG. 2. Watchmaker's Loupe 



placed over the eye and held in position by frowning or con- 

 tracting the eyelid. 



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 



FIG. 3. Folding Magnifier FIG. 4. Reading Glass 



blade of a knife, and when so folded are effectively protected 

 from abrasion by the upper and lower surfaces of the folder. 



READING GLASSES 



Reading glasses (Fig. 4) are large simple magnifiers, often 

 six inches in diameter. The lens is encircled with a metal band 

 and provided with a handle. 



