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 Formulae.
•0000'2665u 2- 004 d.
■00003146D 2— -OOSu.
■00002906?; 2— *0061)
■0UU03026d 2—-0071)
•00003023d 2—'O07iD + 0-3
feet
lbs.
lbs
lbs.
lbs .
lbs
100
•17
-■13
-•48
-•31
-•39
-o-ll
200
■71
+ •27
-•34
-•04
-•19
+ 0-08
300
1-61
1-20
+ •43
+ •82
+ •63
0 - S 8
400
2-91
2-67
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‘oS
6-87
6-70
6-90
700
9'75
10-21
9-82
10-06
9-94
10-12
800
13-25
13-82
13-73
13-82
13-77
13-95
900
17-52
18-00
18-28
18-17
18-22
18-38
1000
22-63
22-67
23-46
23-11
23-28
23-41
1100
28-56
27 " S 7
29-27
2 . 8-61
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
4864
49-55
49-62
1500
59-19
54-00
58-79
56 48
57-64
57-69
1600
67-93
61-87
6 T 74
64-90
66-32
66-36
1700
76-78
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 - S 5
104-00
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•0000 2665v z — 'OO-iv, or (-026657/ — 4) X 'OOlv, in whichwe perceive that the numbers agree nearly with the true re-sistances as far as to the velocity 1100, after which they aregradually more and more in defect, till the error amounts tomore than 7 out of 77, or about the 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-