XXV 
The Mi cr of cope explained. 
C C, is a long fine threaded male fcrew, that turns 
into the body of the microfcope. 
D, a convex glafs, at the end of the faid fcrew, on 
which may be placed, as occafion requires, one of the 
two concave pieces of thin brafs, with holes of different 
diameters in the center of them, to cover the faid glafs, 
and thereby diminifli the aperture, when the greateft 
magnifiers are ufed. 
E, three thin plates of brafs, within the body of the 
microfcope, one whereof is bent femicircularly in the 
middle, fo as to form an arched cavity for the reception 
of a tube of glafs. 
F, a piece of wood or brafs, arched in the manner of 
the faid plate, and fattened thereto. 
G, the other end of the microfcope, w'here a hollow 
female fcrew is adapted to receive the different magni¬ 
fiers. 
H, a fpiral fpring of {feel between the faid end G, 
and the plates of brafs E, intended to keep the plates in 
a due pofition, and counteract againff the long fcrew. C. 
I, a fmall turn’d handle for the better holding the in- 
ftrument, 4 to fcrew on and off at pleafure. 
To this microfcope belong feven different magnifying 
glaffes, fix of which are fet either in filver, brafs, or 
ivory, as in the figure K, and are marked, i, 2, 3, 4, 
5, 6. Obferve thelowefl numbers are the greateft mag-* 
uifiers. 
L is the feventh magnifier, fet in the manner of a 
little barrel, to be held in the hand for viewing any lar¬ 
ger object. 
M is a flat flip of ivory, called a Aider, with four 
round holes through it, wherein to place objects between 
two mufcovy talcs. 
Six fuch ivory Aiders, and one of brafs, are ufually 
fold with this microfcope, fome with objects placed in 
them ? 
