< Page:EB1911 - Volume 20.djvu
This page needs to be proofread.

HISTORY AND CONSTRUCTION]

ORDNANCE

 211

results given by various formulas. These often vary considerably, so in order that a direct comparison in the tables may be made, this value is obtained for wrought iron plate only, using Trcsidder's formula, which is one of the most trustworthy. The equivalent thickness of Krupp cemented steel armour can be obtained immediately by dividing the tabulated value for wrought iron by a “factor of effect” of 2.3 to 2.4 for uncapped armour piercing shot, and about 2.0 for capped armour piercing shell. These factors are dependent on the nature of the projectile and must therefore be taken as approximate.

Tables VIII. -XXII. are obtained from trustworthy sources, but as great secrecy is now observed in many countries there may be a few inaccuracies; in some cases the whole of the data are not available.

Table IX. — French Naval Ordnance, 1910.

Official Designation
of Gun.		Calibre.Weight of
Gun.		Weight of
Charge.		Weight of
Projectile.		Muzzle
Velocity.		Muzzle
Energy.		Perforation
of Wrought
Iron.		Rate of
firing
Rounds.		Propellant.
In.Tons.℔.℔.Ft.-Secs.Ft.-Tons.In.Per Minute.
305 mm.12.01....750287042,89046.015Smokeless
B. Powder
274 „10.834.5562265027,18638.81.5
240 „9.4523.6375287021,44537.o2„
1947.6412.5..190287010,89029.02„
164.7 „6.468.5..11530007,18526.34„
Q .F. Guns-„
164.7 mm.6.468I..11528706,5682455„
140 „5.444.13..6626253,15320.06„
100 „3.943123951,23212.46„
75 „2.9........14311694314.512„
65 „2.57........8.8287150310.812„
47 „1.85..3.328711887.915„


Table X.—German Naval Ordnance.

Official Designation
of Gun.		Calibre.Weight of
Gun.		Weight of
Charge.		Weight of
Projectile.		Muzzle
Velocity.		Muzzle
Energy.		Perforation
of Wrought
Iron.		Rate of
firing
Rounds.		Propellant.
Q.F. Guns-In.Tons.℔.℔.Ft.-Secs.Ft.-Tons.In.Per Minute.Nitro-
Glycerine
powder
28 cm.11.0233.3529285429,87840.21
24 „9.4525.488.2309274016,08631.011/2
21 „8.215.7549.5242252610,70726.13„
17 „6.77.843.113228877,62926.15„
15 „5.94.7319.838824613,69618.07„
10.5 „4.131.6457.2738.3522971,40312.758„
8.8 „3.421.344.8523.627891,27314.710„
5 „1.970.2360663.8621651255.411„

Note. — It is stated that the new German 28 cm. 50 calibre naval gun weighing 43.9 tons fires, with a charge of 291 ℔, a projectile of
760 ℔ with a velocity of 2871 f.s.


Table XI.—Italian Naval Ordnance, 1910.

Official Designation
of Gun.		Calibre.Weight of
Gun.		Weight of
Charge.		Weight of
Projectile.		Muzzle
Velocity.		Muzzle
Energy.		Perforation
of Wrought
Iron.		Rate of
firing
Rounds.		Propellant.
In.Tons.℔.℔.Ft.-Secs.Ft.-Tons.In.Per Minute.
343 mm.13.567.9187.21215206736,05034.0Strip
Ballistite
305 „12512315850258039,22042.0..„
254 „103085450246119,00031.0..
203 „81957250252611,06027.0..
152 „65.717.610022963,65517.0..„
120 „4.722.15.54521161,39711.4
76 „062.1712.522964578.5
57 „2.240.41.05621982016.3..„.
47 „1.810.250673.323301245.8„
This article is issued from Wikisource. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.