230
THEORY AND PRACTICE
TRACT 37
31. Now, by computing, by the preceding formulae, theresistances for all the velocities, they come out as in the fol-lowing table.
Velo-
city
True re-sistanceby exper.
Resistance by the Formula;.
■OOUU'i665a a- 004u.
•OOOOS146i'»— -OOSi).
•00* 0£906v a— *006 d
-■007»
•0000302S1/ 1
—-O07Ju + 0-3
feet
Ibs .
Its
lbs.
lbs.
lbs
100
•17
-•13
-•48
-■31
— •39
- o-ll
20 0
•71
+ •27
-•34
- 04
-•19
+ 0-08
300
1-61
1-20
+ •43
+ •82
+ •63
0-88
400
2-91
267
1-83
2-26
2-05
2-29
500
4-65
4-67
3-87
4-28
4-08
4-29
600
6-90
7-20
6-53
6-87
6-70
6-90
700
9'75
10-21
9-82
10-06
9-94
10-12
800
1 3'25
13-82
1373
13-82
13-77
1395
900
, 17-52
18-00
18-28
18-17
18-22
18-38
1000
22-63
22-67
23+6
23 - 11
23-28
23-41
1100
28-56
27-87
29-27
28-61
28-94
29-06
1200
35-28
33-27
35-70
34-70
35-20
35-30
1300
42-71
39-87
42-77
41-38
42-08
42-15
1400
50-72
46-67
50-46
48 64
4955
49-62
1500
59-19
5+00
58-79
56 48
57-64
57-69
1600
67-93
61-87
67-74
6490
66-32
66-36
1700
70-78
70-47
77-32
73-90
75-61
75.63
1800
85*54
79-20
87-53
83-48
85 50
85-52
1900
94-11
88-67
98-37
93-65
96 01
95-99
2000
102-36
98-67
109-85
’ 04-00
106-92
107-09
1
2
3
4
5
6
7
Where the first column contains the series of velocities, the2nd column the series of true or experimented resistances;the 3rd the resistances as computed by the. formula• 00002665 V 1 — " 004 v , or (- 02665 v - 4 ) x -OOlv, in whichwe perceive that the numbers agree nearly with the true re-sistances as far as to the velocity ilOQ, after which they aregradually more and more in defect, till the error amounts tomore than 7 out of 77, or about the T ' T part, and which there-fore deviates too much from the truth in the higher veloci-ties, Again, the 4th column contains the resistances as com-