XXXV 
The Microfcope explained . 
M iVI M, is a fcollop’d plate, which contains the flx 
tnagniners, numbered from i to 6, the leaft number be¬ 
ing the greateft magnifier j in the center, and on the un-» 
derfide of this plate, is a {hort cylinder, with a fmall 
ffeel pin near the end of it. This cylinder is to be placed 
in the top of the pillar E, in fuch a manner that the 
aforefaid ffeel pin may go into the flit at se. 
N, a black eye piece, hollowed out to defend the eye 
from the fide rays of light, under which the magnifiers 
may be turned round at pleafure. 
O, is a refledting fpeculum of filver highly polifhed 5 
which when an opake objedt is to be viewed, rauft be 
placed under the eye-piece N. By which means, the 
light thrown upon it from the mirrour F, will be by it 
collected and reflected back again upon that furface of 
the objedt next the eye; which will then be fo ffrongly 
illuminated, as to be examined with eafe and pleafure. 
P, is an adjufting fcrew, by the turning of which an 
objedt placed between the objedt carrying plate I 5 and 
fprings b, is readily raifed or depreffed; until it is 
brought into the exadt focus of the magnifier. 
1, 2, 3, 4, 5, 6, are marks on the pillar E, to {hew the 
refpedtive diftances of the object from the magnifiers, ac¬ 
cording as each glafs magnifies more or lefs.—For in- 
ftance, if you ufe the 5th magnifier, firft place it under 
the eye-peice N, and then with your finger and thumb 
turn the fcrew P, till the finger of the hand which is en¬ 
graved on the fliding-piece Q, points to the mark 5 on 
the pillar; then will the objedt be very near its exadt dis¬ 
tance ffom the magnifier \ fo that by a turn or two of 
the fcrew P } either backwards or forwards, to be found 
by trial, you may fioon fit it exadtly to your eye. 
The object carrying plate I, and fteel fprings b, are 
capable of holding ivory Aiders, or other contrivances of 
different thicknefles, by unfcrewing the little fcrew c, 
and with your nail preflir.g down the Aider K, by the 
d 2 button 
