xxn 
The Microfcope explained. 
Culpepper’s double microfcope. 
A BC, fig. ii. is the body of this microfcope, in. 
which Aides C D the inner tube, that contains 
all the glaftes. The eye glafs is at E, the broad middle 
piano convex glafs at F, and the objedt glafs being fet 
in a button at G, is fcrew’d upon the end of the nar¬ 
rower tube I, which being fixed in the bafe of the inner 
tube pafles freely through a hole in the bafe of the 
outer. 
The buttons that contain the feveral objedt glades are 
number’d i, 2, 3, 4, 5, and the convexity of the inner 
tube, is alfo marked with dotted circles numbered 1, 2, 
3, 4, 5, in order to bring that circle to coincide with 
the mouth of the outer tube, whofe number is the fame 
as that of the objedt glafs then made ufe of: but if the 
objedt does not then appear quite diftindt, Aide, or rather 
twift the inner tube gently, higher or lower, or turn 
the fcrew of the magnifier gradually till the objedt ap¬ 
pears diftindt. The greateft magnifiers are known by 
their having the fmalleft apertures. 
The bafe B C of the outer tube is fupported by three 
brafs pillars on fcrols, fixt on a mahogany pedeftal H K, 
in which is a drawer I/, to hold the magnifiers and other 
parts of the apparatus. A little below the objedt-glafs is 
fixed a plate M, like a ftage between the pillars. 
N, three fmall brafs circles with holes through the 
middle of them which are to be placed over the hole in 
the middle of the ftage, and then the ivory Aider O may 
be put between the two uppermoft, which are prefted 
together by a fpiral fpringing wire lodged between the two 
undermoft. The two outermoft being held together by 
four fmall pillars pafiing through four holes in the cir¬ 
cumference of the middle circle. 
Pj 
