Horse Artillery :— 
Weight of gun, carriage and limber as above, no gunners, 
24 noms Omlby, B4ksy Wits “500 00 000 00 3858 lbs. 
x for each horse to pull 52 cwt. or .. iat 633 ,, 
i wagon (no gunners) 66 rounds carried, 33h cwt. 
or. POE EPID SOUR, 
am for each ihonse to pull Da ewt, 0 Ory ee Jae 622 ,, 
Detail of Gun :-— 
Waeieing Y @w7 OBMOS> GP oo. co 00 000 000 400 v00 882 ,, 
Calibre... qonTanG ft oobe | God's) code Saco Spupie tour | ace 2°76 in. 
Length over all . Ss sere rig ane ete een cating Cpiuineedet ans 
Muzzle velocity .. Dee Pree enreeMees ecciea cent aes mee Oe elt 
aes ekenoneey increasing twist. 
Breech-closing arrangement—-Griison falling block. 
Means of firing—Percussion lock. 
‘ Ammunition—Metalic cartridge complete with fuzed shrapnel or high explosive 
shell 
Charge—About 3 Ibs. cubical smokeless powder ‘“ C/89.”’ 
Weight of protectile and fuze—14°3 lbs. 
Length—44 calibres. 
Weight of one round complete! about 19 lbs. 
_ Weight of projectile per square inch of cross section?—2°39 lbs. 
PART II. 
- In his second book (1892) General Wille enumerates the officers and other 
critics who have dealt with his book. He then considers their objections seriatim. 
(1.) Nine writers find fault with the high powder pressure as compared with 
the weight of the gun. They variously estimate the maximum pressure at 24 to 
30 tons on the square inch, giving the strain on the metal of the gun as 20 to 25 
tons per square inch. It is considered that 15 tons per square inch is the maxi- 
mum safe load. In support of this it is pointed out that according to General 
Wille’s own figures the energy developed amounts to 1740 foot lbs. per pound of 
gun, while the highest proportion yet attained (by Griison) is only 960 to 1. 
~ General Wille in reply analyses the calculations of the several critics. He points 
out that the discrepancies in their results are due (1) to various estimates of the 
effective length of the bore, after deducting for the powder chamber and breech- 
block; and (2) to various estimates of the ratio of mean to maximum powder 
pressure. He accepts in each case the mean of their calculations, and works on 
the supposition thatthe rifling is 7 feet long and the mean to the maximum pres- 
sure as 2 to 3. After allowing for twist of rifling and resistance of driving band, 
he gets 25 tons per square inch as the maximum pressure. 
He then considers the most advantageous distribution of weight in his gun, and 
decides on a greatest diameter of 7°875 inches, over a powder chamber of 3°15 
inches, giving a thickness of metal of 2°367 inches. Making this in two layers, 
and supposing the strain on firing to be equally distributed, then, according to the 
German formula? the strain ¢ on the metal is between 225 and 25% tons per square 
inch. : 
1 This leaves 1°7 lbs, for the metallic cartridge. The 6-pr. Q.F. cartridge (the nearest size in 
our service) weighs 1lb. 100z. 
2 Q.F. 12-pr. 1°7 Ibs., 15-pr. 2°1221bs., 15-pr. with 1 1b. fuze, or 16-pr. 2°263 lbs, 
3 Apparently Barlow without constant, 
