( ' 5 6 ) 
Diftancesin 
Inches from 
the touch- 
ing Ends. 
2$i 
3^2 
Hi 
3 2i 
IO^ 
9 i 
Si 
7 a 
<*i 
5 .* 
4 * 
4 
31 
?i 
IJ 
3 
2a 
4 
2^ 
Angle of 
Elevation. 
D. M. 
9—25 
IO—JO 
12 — 40 
15—00 
18—50 
23—25 
JO-GO 
Diftances in 
Inches from 
the touch- 
ing Ends. 
0-45 — 
1 Si 
0-55 
i6i 
1—05 
Hi 
1 — 20 - 
I 2 i 
1 — 30 
IOv 
1—40 - 
95 
2 — 00 — — 
Si 
2—30 * — — 
7 i 
3 — 20 
*i 
4-25 
5 ^ 
6 — 00 — — 
42 
7-23 — - 
4 
Angle of 
Elevation. 
D. M. 
1 — 30 
I-50 
2 — 10 
2 — 40 
3 — 10 
3 — 3 ° 
4— 00 
5- 05 
7 — 4 ° 
10—50 
14— 00 
l8— OQ 
The Planes open’d to an An- 
gle of 1 o' 
The Planes open’d to an 
Angle of 18' 
XV. Infer ip io . 
