278 Instrument to measure and register [Ocr. 
quently when the cone and wedge moved with the apex foremost 
the air impinged at an angle of 43°. 
Column 1 contains the velocity with which the air struck the 
different bodies. 
Column 2, the resistance to the plane in ounces avoirdupois. 
Column 3, the resistance to the base of the cylinder. 
Column 4, the resistance to the base of the cone. 
Column 5, the resistance to the vertex. 
Column 6, the resistance to the plane reduced in the proportion 
of radius to the sign of the angle of in-idence 45°. 
Column 7, the resistance to the base uf the wedge. 
Column 8, the resistance to the vertex: and in the last horizontal 
line but one is set down the exponents of the resistance. 
By looking at the experiments, it is evident that the bases of the 
cylinder, cone, and wedge, are less resisted than the plane; and 
that the cone and wedge, when moving with their bases foremost, 
are less resisted than the cylinder; therefore a mere increase of 
length decreases the resistance to the plane, but not so much as by 
altering the shape of the hinder extremity. With respect to the 
resistance to the apex of the cone and wedge, it is evident that the 
resistance to the former figure is not widely different from the re- 
sistance set down in column 6: and could experiments be made 
free from errors, the resistance would decrease precisely as the log. 
sine of half the cone’s angle ; but with the wedge it is otherwise, 
the resistance decreasing in a greater proportion. 
Experimented Resistances of Water to a Plane containing one 
superficial Foot immersed to the Mean Depth of 6 Feet below the 
Surface of the Waiter. 
Feet} Feet, Lbs. 
Lbs. Lbs. Lbs. Lbs. |Exponents, 
(st | 2d, 3d. 
Ath. 5th. 6th, Tth, | 8th,- 
1 | 0-0156 0°9750 | 
2 | 0-062] 3°3860 
3. } O-1399 87450 
4 | 02487 15°543 
5 | 0°3886 | 24-287 
6 
7 
8 
12949 11329 | 01620 | 071579 
49863 4°3585 | 0°6278 | 0:9725 | 1°9289 
10-931 9°5640 | 1°3670 | 0°8190 | 18956 
19-048 16°687 2°361 1144 1°8699 
29°279 25688 3°59 1 1-401 1°8465 
41°585 36°540 5°045 1565 1°8266 
55°927 AQ 220 6707 1617 18065 
72°270 63-707 8°563 1'532 17854 
90°590 79°983 10°607 1°293 1°7682 
0°5596 | 34975 
O°7616 | 47-603 
0 9948 62°175 
9 | ¥'2590 } 78-690 
383°61 420°16 + | 382:92 31°24 5°690 1°5312 
10 | 15544} 97°150 | 11036 | 98-040 | 12:82 | 0-90 | 1-7448 
11 | 18806 | 117-82 | 13305 | 117-86 | 1519 | o-os0 | 1-1982 
12 | g-0383 | 139-90 | 157-20 | 130-49 | 17-71 | o-3590 | i-t0st 
13 | 26270 | 161-18 | 183-40 | 16473 |1867 | 0-450 | 1-4857 
14 | 30476 | 190-42 | 211-51 | 19039 | at-12 | 0-030 | 16630 
15 34974 | 21859 | 24154 | 217-89 | 23:65 | 0-700 | 1-6380 
163-7973 | 248-71 | 213-48 | 247-23 | 2625 | 1-486 | 1-6198 
17 | 44993 | 98077 | 30733 | 27840 | 98-99 | 2970 | 1-5977 
18 | 5-0363 | 34-77 | 343-05 «| 31039 «| sie =} 3-380 | 15754 
19 | 5e1i4 | 350-71 | 38016 | 345-73 | 34-43 | 4-980 | 15581 
20 | 62477 | 
| 19243} 19474 
