% The Microfcope explained. 
furnifiied with a pair of thin glafies; thefe are to be put 
between the plates r f, and t y, then by turning the but¬ 
ton w, the convex lens or magnifier z, may be removed 
to a proper focus, fo as to exhibit a diftindt image of the 
©bjedt upon the fcreen. There are three fuch mahogany 
Aiders, like W. and three others with larger holes re- 
prefented at X. 
A defcription of the tooth and pinion microf¬ 
cope, confidered as a fingle microfcope. 
T HIS inftxument N P, fig. 5. with its apparatus 
of fix magnifiers fixed in buttons like Y, which 
are to be fcrewed into the end i P, inftead of the wheel 
P Q, makes a complete and ufeful fingle microfcope, 
when put into a pocket cafe with ivory Aiders E, glafs 
Hips F, fmall brafs Aiders R, glafs tubes, &c. the ufe of 
each of thefe parts have been already fhewn. To which 
may be added to the fide of the microfcope, an arm or 
handle, when defigned to be ufed with the aquatic or Mr. 
Ellis’s microfcope, which will be defcribed hereafter. 
The life of the new improved folar microfcope, 
applied to a new improvement on the pyra- 
midical camera obfcura, when illuminated by 
the folar rays. 
S EE figure 6. in which AB, AC, reprefent two 
Tides of the camera obfcura when put together, its 
upper Aiding tube reprefented at P Q_, fig- 8. being 
taken out and laid afide, the circular box A D F, put 
on in its fiiead and held faft by two bolts, this being 
done, Aide the arch G H, fig. 6. into its receptacle at K, 
and fet the degree anfwering to the latitude of the place 
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