424 Some Account of a new Microfccpe v 
Number as that of the Magnifier employed, 
its local Diflance is brought nearly right. 
When the Pillar C is fattened, the Mi- 
crofcope (by the fine-threaded adjutting 
Screw E) may, be moved fo gently up or 
down, without Jerks or Slips, that the true 
Focus may be found with great Readinefs 
and Exadtnefs. 
The horizontal Plate or Stage F, having 
in the Middle thereof a circular Hole 4, di¬ 
rectly over which the Body of the Micro- 
fcope is fufpended, is exceedingly convenient 
to place Objedts on for Obfervation, being 
freed inti rely from the Legs which incumber 
other Double Microfcopes. 
The concave Lookiog-Glafs G, turning 
on two final! Screws in the Arch d (at the 
Bottom of which a Pin goes down into the 
Hole<? in the Pedeftal) reflects the Light of 
a Candle or the Sky diredtly upwards on the 
Object, by moving the Looking-Glafs hori¬ 
zontally or vertically. 
A double convex Lens H, turns on two 
Screws, for tran fixfitting Light to afiift in 
illuminating opake Objects, when the long 
round Wire/'is placed in the Spring-Tube 
g, at the Corner bf the Stage F. 
I—is a hollow Cylinder whole Sides are 
open, and at whofe End a concave Silver 
Speculum /), having a round Hole in the 
Midft thereof, is fere wed. This Cylinder 
flips over the Snout i of the Microscope, and 
