xxxii jT he Microfcope explained. 
To this microfcope we frequently add a Wilfon’s mi¬ 
crofcope, fig. 12. to which is fixed an arm like that at 
E, fig. 15. inftead of the handle I, fig. 12. by this 
means we have a more commodious inftrument than that 
before defcribed, fig. 13. of fixing Wilfon’s microfcope 
and reflecting light to it by the mirror, becaufe we have 
Wilfon’s for tranfparent, and this aquatic for opake ob¬ 
jects. 
But lately inftead of applying Wilfon’s, we have with 
greater propriety added the tooth and pinnion microfcope, 
fig. 5. in one cafe with Ellis’s microfcope j by which 
means we have a more convenient inftrument, that con¬ 
tains the principle apparatus of both, combined into a 
proper fize for the pocket. 
A Tingle and double aquatic microfcope. 
T IHIS inftrument has fome advantages peculiar to 
itfelf. Fig- 16. and fig. 17. reprefent the prin¬ 
cipal part of the inftrument 5 the firft fhews it ereCf, the 
fecond in an inclined pofition. 
The magnifiers. No. 6. are to be placed in the ring, 
fg, of fig. 16., 
i, 1 , k, is the ftage or objeCt carrying plate, upon 
which ivory Aiders No. 9. or flips of glafs not expreft- 
ed in the plate, a round glafs, or a concave glafs No. 8. 
may be placed, each of them occafionally, and agreeable 
to the objeCt intended to be viewed. 
Upon one or other of thefe all objeCts are to be laid 
for examination. 
r, t, s, is the mirror, to refleCl light through any 
tranfparent objefit. 
When either of the magnifiers is placed in the ring 
fg, fig. 16. and an objedt laid upon the ftage i, l,k, 
ft may be brought nearly to its focus, by difcharging the 
fcrev^ 
