_Velocity of French Ordnance._
24 Pr. charge 8 lbs. the eprovette mortar giving 125 fathoms, the
initial velocity is 1425 feet _per_ second; with the eprovette at 90
= 1209 feet; with a charge of 12 lbs. and the eprovette at 125; the
initial velocity will be 1530.
Charge. Eprovette. Velocity.
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16 Pr. 5 lbs. 125 1415
” ” 8 ” 1510
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12 Pr. 4 ” 1520
8 Pr. 2½ ” 1418
” ” 3 ” long guns 1460
4 Pr. 1 ” 1335
” ” 1½ ” 1508
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12 Pr. 4 ” 1442
8 Pr. 2½ ” field guns 1422
4 Pr. 1½ ” 1446
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8 Inch How’r. 1 ” 390
” ” ” 1 2 oz. ” 516
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6 Inch How’r. 1 ” 532
” ” ” 1 12 ” 704
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_Lombard’s Tables._
_VENT._—The vents of English guns are all ²/₁₀ of an inch diameter.—See
remark 9 of the article _Velocity_.
_WEIGHTS._—See _Measures_.
_WINDAGE._—The usual windage of English guns is ¹/₂₀ of the caliber. It
appears by experiments, that ¼, or nearly ⅓ of the force of the powder
is lost by this windage.—See remark 8 of the word _Velocity_.
_Windage of Guns and Carronades._
+--------+---+---+---+---+---+---+---+---+---+---+---+---+
|Natures.| 68| 42| 32| 24| 18| 12| 9| 6| 4| 3| 2| 1|
+--------+---+---+---+---+---+---+---+---+---+---+---+---+
|Guns | --|.33|.30|.27|.25|.22|.20|.17|.15|.14|.12|.09|
|Carrona.|.15|.15|.15|.14|.12|.12| | | | | | |
+--------+---+---+---+---+---+---+---+---+---+---+---+---+
_Windage of Mortars and Howitzers._
From the 13 to 5½ inch the windage is .15 of an inch, and that of the
4⅖ is .2 of an inch.
_Windage of French Guns._
_Field Guns._—All one line of windage; about ¹/₅₀ in an 8 pounder.
_Siege Guns._—All 1½ line; about ¹/₄₈ in a 24 Pr.
_Mortars._—12 Inch; 4 lines of windage.
10 Inch; 1 line, 5 points ”
8 Inch; 1 line, ”
_Howitzers._—All; 2 lines ”
_WOOD._—Artillery carriages are generally made of elm, ash, and oak.
The bed and house of a sea mortar are made of oak, and the bolster of
elm. The bottoms of land mortar beds are of oak, and the upper parts of
elm.
_Carriages_—_Ship._—The cheeks, transoms, and trucks of
elm; the axle trees of oak.
” _Garrison._—The whole of oak; trucks, iron.
” _Field._—Heavy 24 and 12 Pr. the cheeks and
transoms of elm; the axle trees of ash.
In the wheel the nave and fellies are
of elm; the spokes of ash; limber
shafts, bars, and axle trees are of
ash. Light guns, from 3 to 12 Prs. the
cheeks and transoms are of elm; the
ammunition boxes are of fir. In the
wheels, the nave is of elm, the spokes
of oak, and the fellies of ash. In the
limber the shafts and bars of ash.