a o4 Microscopical Essays. 



F, a piece of wood or brafs, arched in the manner of the fai<t 

 ;plate, and fattened thereto. 



G, the other end of the microfcope, where a hollow female 

 fcrew is adapted to receive the different magnifiers. 



H, a fpiral fpring of fleel between the faid end G and the 

 .plates of brafs E, intended to keep the plates in a due pofition, 

 .and .counteract againft the long fcrew C. 



I, a fmall turned handle, for the better holding the infi rumen t, 

 which fere ws on and off at pleafure. 



To this microfcope belong feven different magnifying glaffes, 

 fix of which are fet either in filver, brafs, or ivory, as in the 

 figure K, and are marked l, 2, 3, 4, 5, 6: obferve, the loweft 

 numbers are the greateft magnifiers. L is the feventh magnifier, 

 fet in the manner of a little barrel, to be held in the hand for 

 viewing any larger object 



M is a flat flip of ivory, called a Aider, with four round holes 

 through it, wherein to place objects between two mufcovy talcs. 



Six fuch ivory Aiders, and one of brafs, are ufually fold with 

 this microfcope,' fome with objects placed in them, and others 

 empty, for viewing any thing that may offer ; but whoever pleafes 

 to make a large colkaion of objefts, may have as many as he 

 defines. There is alfo a brafs Aider, not exprefled in the figure, 

 to confine any fmall objed, that it may be viewed without crufh- 

 ing or del troy ing it. 



N fs 



