+ HISTOLOGY OF MEDICINAL PLANTS 
FORMS OF SIMPLE MICROSCOPES 
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 
Fic. 1.—Tripod Magnifier Fic. 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 
Fic. 3.—Folding Magnifier Fic. 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. 
