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GENERAL REPORT OF THE JUDGES OF GROUP XVI. Here E t equals the total energy of the projectile, on impact, in foot tons ; IV equals the weight of the projectile, in pounds ; and v equals the velocity of the projectile, upon impact, in feet. The facility with which the projectile will perforate an armored structure depends upon its diameter as well as upon its energy; but scientific artillerists are not agreed upon the expression which most faithfully represents' the comparative powers of different diameters. As an illustration, how ever, we shall select the English expression, which assumes that the resistance offered by armor varies as the calibre. It is usual to ex press this rule by introducing into the formula the shot’s circum ference in inches, and to call the result of the computation the “ energy per inch of the shot’s circumference.” Thus, if E, be the total energy and E u the energy per inch of the shot’s circumference: E JVv 2 E — -EL = i, I " ~ D 4480D ^ where D is the diameter of the projectile in inches. The following table gives the principal dimensions and weights of English, French, and German armor-piercing guns, and a comparison of their relative merit as indicated by equation (2): THE ENGLISH, FRENCH, AND GERMAN SYSTEMS OF HEAVY ORD NANCE, 1876. PARTICULARS. Gun. Calibre, inches Length of bore, inches Total weight, tons Common Shell. Weight empty, pounds Diameter, inches Length, inches Bursting charge, pounds Total weight filled, pounds*. Battering Projectile. Diameter, inches Length, inches Total weight, pounds Battering Charge. Weight, pounds Muzzle velocity, feet Total energy at muzzle, foot tons ENGLISH. FRENCH. GERMAN. 12.5-iN. I I*IN. io-in. 12.5-iN. Il-IN. 9.5-IN. 11-iN. io-in. 9-iN. 12-5 198 38 II 145 25 10 145-5 18 12.6 204.1 34-5 10.8 163.7 21.7 9-5 162.6 13.8 11.02 207.1 27.07 10.24 194-5 21.65 9.27 177.6 15.26 668 12.42 36.2 501.25 IO.92 34-2 374 9.92 593-5 12.66 34-i 38-1 631.6 3038 10.89 24.02 13-67 3 r 7-5 211.25 9-55 381 11.16 330-7 10.37 247 938 43-8 726.5’ 28.75 53® 27.1 401.1 9.25 220.5 23-48 404.5 19.8 350.5 15 262 12.42 33 815 10.92 9.92 12.66 10.89 9-55 ir.16 27.56 517 10.37 25-6 4 I 4-5 9.38 23.2 306.4 535 400 J 760.5 476.4 317-6 130 1,425 11,160 85 i3*5 *415 70 1364 5160 136.7 1312 9080 88.2 1378 6270 61.7 1427 4480 88.18 *394 6970 7°-55 1385 5515 52.9 1312 3660 The greatest amount of work realized in any gun to date (August ■5, 1876) resulted in firing the 80-ton Woolwich gun, bored to 16 * Experiments are in progress with a common shell 815 pounds in weight and 37.5 inches long. 'rewnnfM ■*