GUNNERY: 
579 
ht of 561b. 3oz, and the following results were |= Mr Robins suspects, that in experiments 26 and 27 a Initial V. 
1ed oe mye mistake had been made in the weight of the powder, loeities 
*s owe — or that the barrel had been damp. Projeatics. 
5 |Length of ‘3, | Chord of the 3 Another barrel D was now used, 7.06 inches long v 
ie & abe te bs ng BF sé and 0.83 in diameter. Its bullet, which weighed 33 
25 E Powder, or Tad 13s 7] dwts. was exactly fitted to the bore without any wi 
28. Line AF in i et e 23 £ age, so that it went in with difficulty. 
tm] Fig. 5. iy i? ; P| - 
wet Inches, |Dwts| Inches. {Inch, | Inches. Length of feed ST: a6 
4/A 2 6] 119 |12.1| 4.2 i the Cavity [Mantity) ascending | same by} BtTor of 
5 A 6 12.2 12,1) —.1 g bya mer ted Powder. | measured on|,,. Theory. 
6)/A} 1 6| 132 13.6] 4.4 a ; the Ribbon. |TB¢ory- 
7\A i 6 13.9 |136| —8 — 
BIA | [= 7924 16.7. 417.2) 4.6 j) Inches, | Dwts. Inches. | Inches. | Inches, 
991A 12] 17.5 |17.2| —3 Aj| 2% 12 9.2 9.2 0 
110] A: at 12] 169 16.8) —1 | {A | +24 12 9.5 92) —3B 
aj A. 12) 17.0 |168| —2 A) 5% 24 1L7 11.3 | —4 
12) A at 6). M7 16) 2.) A| %% 36 13.2 126 | —6 
}13 | A 2 | 6} 141 [115 | 44 A it 12 9.3 91 | —.2 
4/)A 2b 121 167  |16.3| —4 - z + - ; rr + . 
In calculating the theoretical results for the experi- C at 12 6.5 6.6 ss dl 
ments 10—1}4, an allowance ‘was made for the quantity B 25 12 8.0 82) +.2 
of bullets lodged in the board, which increased the B 25 12 8.3 oe eS 
weight of the peridulum. : ta A 25 12 9.5 91-4} —A 
e next e: ents made by Mr Robins were with A 25 12 9.1 9.1 OL 
another barrel C, which had the same bore with the last, |47| A 25. 6 72 66. | wees? 
but which was only 12.875 inches long. Thependulum |yg} 4 25 6 6:7 eR 
was rather lighter than 56 lb. 3 oz. 49 | C 25 12 68 6.7 ed 
“ ae 50; C | 24 12 7.5 6.7 | —.8 
$ £|..% | Extent of Chord pf the | rng | 4. . : 
5 Ele | the cavity hires — same by pe es ' “ a 3 ta is pers 
ee be & Sbteining Powder. mde’ on the: | Theory 53| D 2 12 7.0 7.2 + 2 
el eer the Ribbon. | TB?" {54| D | 2% | 12 71 68 | —.3 
55|D | 2 6 4.7 48} 4.1 
< ; Inches. | Dwts. Inches. ‘Inches. | Inches. 56| D 26 6 48 4.8 0 
wilc] 2 12 27 (128) 42) b7la| ac 6 6.4 6.5 | 4.1 
A6}C | 24 12 12.6 12:8 | + 2] I5g] A i 6 6.4 6.5 + .1 
AT | Col - 28 12 12.4 128 |}'44] |59| A an 6 6.6 65} —.1 
18;A Qs 12 17.0 17.8 } +3] gol A PEM 6 6.7 6.5 aeticlll 
Ag} A) 2 | 12) 172 “Pi72] 0} fila | ae. | 12 9.0 91 | 4.1 
}20} A | 28 12 7A | 17.29) pd 
21;/A] 28 12 17.2 | 172 0 ; 
22) A | 2 6 } 124 12.2.) — ‘2 Mr Robins s, that the error in the 50th ex- 
Another barrel B of the same bore with A and C; 
but 24.312 inches long, was now used, with a pendu- 
lum a little heavier than 56 lb. 3.0z.. A correction was 
made for the increase of weight, as formerly. 
sels Bxtent of ‘| Chord of the : 
Z B the Cavity Quantity) _ sscending se Error 
| &|containing| , Avch the |, of the 
‘ zs 5 ithe powder. Powder. Ria rae Theory. (Theory. 
, Inches. | Dwts. Inches, _| Inches. laches. 
23) Al 25 12 17.1 17.2 | 4A 
| A) of 9 15.2 15.0. |. — 2 
25) Al 25 9 15.4 15.0 | —.4 
26|\ ¢ 124 12 11.5 12:8 | 41.3 
27) C 25 12 11.5 12.8, | +L3 
28) C4. a8 6 srr oT 8 
29|C | 26 12 12.3 12.5 | +.2 
30; B] 25 12]. 44 |144 | 00 
31 | B a 12 14.4 14.4 | 0.0 
82) Bi 2 ae 10.3.).-}10.5 | + 2 
BS) A} 12 8 | 7 | 145 )—2 
34 | Al 4 12 |  15.7.. 5|.15.3 | —.4 
riment was owing to the wind. All the preceding 
<auedtiahels were made and registered, before they 
were compared with the theory. 
A set of valuable experiments on the initial velocities . 
of bullets were made by Antoni, with the machine in- Astoni’s 
vented by Mattei. pane 
The series was made with a musket 3 feet 6 Vojocities. 
inches in the length of its bore, and with a charge of 
powder of 7 drams. 
Mean state 
Nature of the Powders Moist | of the At-| Very dry 
Weather | mosphere.| Weather. 
Feet. Peet. Feet. 
Common war powder’ 1342 | 1542 | 1618 
Fine do. 1569 1736 1829 
Fowling powder 1566 | 1703 | 1784 
Firework powder 1566 1706 1779 
The following experiments were made under a mean 
sate iP sc atmosphere, with guns of different lengths 
and calibres. 
