Some Account of a new Mter of cope. 423 
line-threaded Screw td regulate and adjuft 
its Motions, and adding a concave Speculum 
for Objects that are opake. 
The foregoing Examinations having been, 
all made by an Inftrument thus improved, I 
{hall give a Plate and Defcription of it, (as 
an Addition to my former Book on the Mi- 
crofcope) by the Name of Mr. C uf’s new - 
conjirudied Double Microfcope . 
All Parts of this Inftrument are Brafs.—- 
The Body A, being firmly fupported'in a 
broad circular Collar at the End of the Arm 
ci a, which projects from the Top of the 
Pillar C, may be taken out or put in at Plea- 
fure. 
A fquare Box b b f fere wed down to the 
wooden Pedettal II, fupports the whole Ma¬ 
chine, by the Affiftance of the long Hat— 
fquare Pillar B, which is fixt within the faid 
Box. 
The moveable Pillar C, which is fhorter 
than the Pillar B, tho’ of the fame Shape, by 
Aiding up or down againfl the broad flat 
Side of the faid Pillar, raifes or lowers the 
Body of the Microfcope as Occafion may re¬ 
quire.—Both Pillars Hand in the Box b b. 
The fquare Collar D holds the two Pillars 
B and C together, and Aides up or down 
upon them, carrying with it the Body of the 
Microfcope.-The Screw-Button 3 is in¬ 
tended to fix the Pillar C, when the upper 
Edge of the Collar D being fet at the fame 
E e 4 Number 
