*The Microfcope explained. xxxix 
ed, or from whence it may be eafily taken; this arm 
proceeds from the upper part of the Aiding focket T, f. 
The aforefaid focket T, f, together with the fcollop’d 
plate M M. M, and the body of the microfcope, may be 
moved up or down the fquare bar R S, which is divided 
into as many parts (i, 2, 3, 4, 5, 6.) as there are mag¬ 
nifiers of different foci ", fo that the diftance of the ob¬ 
ject from the objeCt-glafs may be found without any 
trouble, by fetting the finger of the hand engrav’d upon 
the focket, to the correfpondent numbe rof the magnifier 
(the nunder the body of the microfcope) on the bar R S, 
and fixing it there by help of the fcrew h. But as it is 
fcarce exactly enough determined this way, the object 
may be brought nearer to, or removed farther from the 
magnifier at difcretion, by a turn or two of the fcrew P. 
Remembering at the fame time, the upper hand is fet to 
any number on the fquare bar, to place the index on the 
piece Q, to the fiower-de-luce on the upright pillar E. 
O, is a reflecting fpeculum highly polifhed, which 
muft be placed at R, when an opake objeCt is to be 
viewed, on which a direCt light becomes reflected from 
the aforefaid fpeculum. 
The fquare bar R S, fits into the top of the upright 
pillar E, and may be made faff thereto by the fcrew at ae. 
The object-bearer I, ivory Aider, illuminating glafs 
F, with its fupport H, and round piece G, and the ap¬ 
paratus V, with its nippers and Aiding wire, &c. having 
been fufficiently defcribed in the ufe of the Angle uni- 
verfal microfcope, 1 fliall refer the reader to that for the 
ufes thereof, and alfo for a defcription of the apparatus, 
which is exaCtly the fame as that reprefented in fig. 19. 
and its ufes and application to this univerfal double mi¬ 
crofcope, the very fame as in the foregoing univerfal An¬ 
gle one, 
A 
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