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Purpofes of his great Number, and his Obje&s would 
have been preferved in a much better Manner. 
1 fhall forbear troubling you with the different 
Microfcopes invented by IVilfon , Marjhal, Culpeper , 
Scarlet , and others, (though all deferving Praife) fmce 
you are already fo well acquainted with them : But 
Two extraordinary Improvements have appeared 
within thefe Two Years, which I beg Leave to lay 
before you, as I think it has not been, yet done. — - 
1 mean, the Solar or Camera Obfcura Microfcope, 
and the Microfcope for opake Obje&s. Both thefe 
Inventions we are obliged for to the ingenious Dr. 
Liberkhun , who, when he was in England laft 
Winter was Twelvemonth, fhewed an Apparatus of 
his own making, for each of thefe Purpofes, to feveral 
Gentlemen of this Society, as well as to fome 
Opticians, amongft whom Mr. Cuff., in Fleet flreet, 
has taken great Pains to improve and bring them to 
Perfe&ion ; and therefore the Apparatus prepared by 
him is what I am about to deferibe. 
This Solar Microfcope is compofed of a Tube,, a 
Looking-glafs, a convex Lens, and a Microfcope. 
The Tube is of Brafs, near Two Inches in Diameter, 
hxedin a circular Collar of Mahogany, which, turning 
round at Pleafure, in a fquare Frame, may be adjufted 
eafily to a Hole in the Shutter of a Window, in fuch 
a Manner, that no Light can pafs into the Room but 
through the aforefaid Tube. Fattened to the Frame by 
Hinges, on the Side that goes without the Window, is 
a Looking-glafs, which, by means of a jointed brafs 
Wire coming through the Frame, may be moved 
either vertically or horizontally, to throw the Suns 
Rays through the brafs Tube into the darkened 
Room. 
