OQU 
ORA 
Taste I. For extending the Scale by a Lens of four Inches Focus, 
4 2.00 Ii 2.93 30 3-52 200 3-92 — 35 4-53 — 12 6.00 
5 2.22 12 3.00 40 3-64 ce) 4.00 — 30 4.62 — 1.1 6.29 
6 2.40 13 3-06 50 3-70 — 200 4.08 — 25 4-76 | — 10 6.67 
7 255 14 3.11 60 3-75 — 100 4-17 — 20 5-00 | — 9-5 6.90 
8 | 2.67 1§ | 316 | 70 | 3.78 | — 50 | 435 | — 15 | 5.45 9-0 7-20 
9 | 277 20 | 3-33 8o | 381 | — 45 | 439 | — 14 | 5.69 | — 85 7-56 
Io 2.86 25 3-45 100 3.85 — 40 4044 —, 13 5-78 — 8.0 8.00 
Taste II. For placing the Numbers indicating the focal Length of Convex Glaffes. 
| Foc.| VIL. XIT XVII. f Foc. | VII XIE. XVIIT Foe VOU. XIL XVIIE. | 
lo 8.00 | 12.00 | 18.00 | 20 | 13.33 30.00 180.00 8 oo — 24.00 | — 14.40 
40 | 10.00 | 19.14 | 32.73 | 18 | 14.40 36.00 oo 7 | — 56.00 | — 1680 | — 16-45 
36 | 10.28 | 18.00 | 36.00 | 16 | 16.00 48.00 | — 144.00 6| — 24.00 | — 12.00 | — 9.00 
30 | 10.91 | 20.00 | 45.00 | 14 | 18.67 84.00 | — 63.0 5 | — 13-33 | — 857 | — 5-92 
28 | 11.20 | 21.00 | 50.40 | 12 | 24.00 oo — 3600 | 4.5] — 10.29 | — 7.20 | — 6.00 
26 | 11.56 | 22.29 | 58.50 J IT } 29.33 | — 132.00 | — 28.29 | 4.0] — 8.00 | — 6.00 | — 5.14 
24 | 12.00 | 24.00 | 72.00 |‘10 | 40.0 — 6000 | — 22.50 135] — 622 | — 454 | — 4-34 
22 | 12.77 | 26.40 | 90.00 | 9g {72.00 | — 36.00 | — 18.00 [3.0] — 480 | — 400 | — 3.6 
Taste III. For Concave Glaffes. 
Number. Pars aa Se Neareit Place. | Number. Pee oe Neareft Place. | Number. Rising Pls a Neareft Place. 
° 4.00 4 8 2.67 14 3-00 
I 24 3-43 8 7 2.54 1S. 2.95 
2 18 327 9 6 2.40 16 2.50 
3 16 3-20 10 5 2.22 17 2625 
4 12 3-00 II 4.5 2.12 18 2.00 
5 10 2.86 12 4.0 2.00 19 1.75 
6 9 2.77 13 355 1.87 20 1.50 
OPUAGO, in Geography, a town of America, in Tioga 
county and ftat te of New York; 15 miles N.W. of New 
ork, 
OPULUS, in Botany. See Visurnum. 
OPUNTI IA. See range 
US, in Geography, an ifland of Dalmatia, at the 
mouth of the Narenza. This ifland receives from the floods of 
i ich mak 
a town of New we peorle: 3; 210miles §.S.E. of 
Cafa Grande. 
OQUE aes atown “ ape in me province of Alava ; 
sit ge of Ordun 
VoL. XXV 
OR, or Org, a lake of Norway, in the province of - 
Aggerhuus ; 36 miles N. of Chriftiania 
R, in Heraldry, yellow, or the colsur Id. 
_ ut this colour, or argent, filver, dere can be no 
00 
. In the eee of it is called topar 5 and in thofe of 
fovereign princes, fol. It is ‘acre in ie ig by 
ma point s, or dots, all over the field, 
It is acounted the vane of Sittin (ageances faith, 
force, wPOn.’ Se 
” gee ‘Tow 
S never 
othic ftates upon the Baltic, it appears t 
d that 
it likewife appears that the Danifh ora, derived by corruption 
from aureus, was the fame as the Frank folidus of twelve 
3Q pence. 
