The Double RejlcBing MicrofcOpe . 17 
or lower, turn the Screw of the Magnifier, 
gradually, till the Objed appears diflind.— 
Take Notice, that the greated Magnifiers 
have the fmallefl Apertures and the lowed 
Numbers. 
L. is a circular Plate of Brafs, lixt hori¬ 
zontally between the three Brafs Pillars ; 
and in the Center thereof a round Hole M. 
is adapted to receive a proper Contrivance 
N. for holding Ivory Sliders, wherein Ob¬ 
jeds are placed : which Contrivance con- 
lifts of a fpiral Steel Wire confined between 
three Brafs Circles, one whereof is move- 
able for the Admiffion of a Slider. 
O. is a round Brafs Plate, with feveral 
Holes for placing Objeds in, fome of which 
are uduallyf 11 rnifhed with them at the Shops : 
but two Holes are commonly referved for 
fmall concave Glaffes, whereon to place a 
Drop of any Liquid, in order to view the 
Animalcules, &c. There is alfo a Piece of 
white Ivory, and a Piece of black Ebony, 
of the fame Size and Shape as the Holes for 
Objeds : the Ivory is to put opake Objeds 
on that are black, and the Ebony is to re¬ 
ceive fuch as are white; by which Contra¬ 
riety of Colours they will be feen more 
clearly.——At the Bottom of this Objed-- 
Plate is a Button, to flip into a Slit P. that 
fits it, on the circular Plate of Brafs: and by 
turning it round on this Pin, all the Objeds 
