THE ROYAL ARTILLERY INSTITUTION. 
167 
2-27365 = 1-0023788 + 14 - 2 1 X ^ 0023 ?g g # 
H0M788 a 14Wxi ;°? gL 8 . 
1427 x 1-0023788 
1-2712712 
1125-2. 
That is to say, in passing over the first 90 ft. of air, the 110-pr. solid 
shot loses 4-5 ft. of the velocity with which it started. Of course the 
truth of this theorem depends almost entirely upon the value given to the 
ballistic coefficient C, and this latter depends upon the value of the constants 
A and r. I have taken these constants according to Didion's law of the 
resistance, which perhaps is still capable of correction;* however, at present, 
it is the best and most accurate law we know, and at short distances, the 
results obtained by it may be considered correct. 
III. 
Table shewing the Times corresponding to the Arcs for Instrument No. 32, 
the time of a small Oscillation being — 0-3337 seconds. 
Arc. 
Total 
Duration. 
Partial 
Duration. 
Arc. 
Total 
Duration. 
Partial 
Duration. 
Arc. 
Total 
Duration. 
Partial 
Duration. 
30 
•112397 
•001945 
65 
•171342 
•001536 
o 
100 
•225546 
•001633 
31 
•114342 
•001919 
66 
•172870 
•001533 
101 
•227179 
•001643 
32 
•116261 
•001895 
67 
•174413 
•001531 
102 
•228823 
•001653 
33 
•118156 
•001872 
68 
•175944 
•301529 
103 
•230476 
•001664 
34 
•120028 
•001851 
69 
•177474 
•001527 
104 
•232141 
•001676 
35 
•121879 
•001830 
70 
•179002 
•001525 
105 
•233817 
•001688 
36 
•123710 
•001811 
71 
•180527 
•001524 
106 
•235506 
•001701 
37 
•125521 
•001793 
72 
•182052 
•001523 
107 
•237207 
•001714 
38 
•127314 
•001775 
73 
•138576 
•001522 
108 
•238922 
•001728 
39 
•129090 
•001759 
74 
•185098 
•001522 
109 
•240650 
•001743 
40 
•130849 
•001743 
75 
•186621 
•001522 
110 
•242393 
•001759 
41 
•132592 
•001728 
76 
•188144 
•001522 
111 
•244153 
•001775 
42 
•134321 
•001714 
77 
•189667 
•001523 
112 
•245928 
.001793 
43 
•136035 
•001701 
78 
•191190 
•001524 
113 
•247721 
•001811 
44 
•137737 
•001688 
79 
•192715 
•001525 
114 
•249533 
•001830 
45 
•139425 
•001676 
80 
•194241 
•001527 
115 
•251363 
•001851 
46 
•141102. 
•001664 
81 
•195768 
•001529 
116 
•253214 
•001872 
47 
•142766 
•001653 
82 
•197298 
•001531 
117 
•255086 
•001895 
48 
•144420 
•001643 
83 
•198830 
•001533 
118 
•256981 
•001919 
49 
•146063 
•001633 
84 
•200364 
•001536 
119 
•258901 
•001945 
50 
•147697 
•001624 
85 
•201900 
•001540 
120 
•260846 
•001972 
51 
•149321 
•001615 
86 
•203441 
•001543 
121 
•262818 
•001999 
62 
•150937 
•001607 
87 
•204985 
•001547 
122 
•264818 
•002030 
53 
•152544 
•001599 
88 
•206537 
•001551 
123 
•266849 
•002062 
54 
•154144 
•001592 
89 
•208084 
•001556 
124 
•268912 
•002097 
65 
•155737 
•001585 
90 
•209641 
•001561 
125 
•271009 
•002134 
66 
•157322 
•001578 
91 
•211202 
•001566 
126 
•273144 
•002173 
57 
•158901 
•001572 
92 
•212769 
•001572 
127 
•275318 
•002216 
58 
•160473 
•001566 
93 
•214342 
•001578 
128 
•277534 
•002261 
59 
•162040 
•001561 
94 
•215920 
•001585 
129 
•279795 
•002310 
60 
•163602 
•001556 
95 
•217505 
•001592 
130 
•282106 
•002363 
61 
•165158 
•001551 
96 
•219098 
•001599 
131 
•284469 
•002421 
62 
•166710 
•001547 
97 
•220698 
•001607 
132 
•286891 
•002484 
63 
•168258 
•001543 
98 
•222306 
•001615 
133 
64 
•169201 
•001540 
99 
•223921 
•001624 
* Experiments are being made, under the directions of the Ordnance Select Committee, to deter¬ 
mine the laws of the resistance of the air to the motion of projectiles; and up to the present 
time there is reason to believe that General Didion’s coefficients are nearly correct for rifle projectiles, 
but that they are too small for spherical shot of large calibre. 
[VOL. III.] F 
2-27365 — 
