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GENERAL REPORT OF THE JUDGES OF GROUP XVI. 5 years of active service during the late war, traveling over 4000 miles with the Army of the Potomac and with General Sherman. The veterinary exhibit of this department is worthy of special notice, as showing the system of shoeing in use by the army. It contained many specimens to illustrate the injuries and diseases of the horse. The Signal Service Bureau made an interesting exhibit, especially of its field-telegraph train, consisting of one battery, four wire-, and four lance-wagons, capable of transporting fifty miles of portable telegraph line; also of its flags, heliographs, and other apparatus for communicating signals for an army in the field. The Bureau of Ordnance of the Navy made a large and attractive display of material used by that branch of the service. In artillery- and machine-guns the collection was specially designed to give an idea of the successive stages of progress during the past century. The following table furnishes details respecting the larger guns: DIMENSIONS. 15-iNCH Smooth Bore. II-INCH | Smooth Bore. | 9-inch | Smooth Bore. 8-INCH Smooth Bore. 8-inch Converted Rifle. 1 ioc-Pdr. Parrott Rifle. 1 6o-Pdr. Parrott Rifle. Total weight, pounds. Length of bore, inches Calibre, inches 42,000 146 15 i5,7«>o I 3 I it 9,000 107 9 6,500 96 8 17,275 126 8 15 9,700 130 6.4 5,400 105 5-3 18 12 Projectile, pounds Charge, pounds j Shot, 440 (Shell, 352 | 100 Shot, 166 Shell, 138 15 Shot, 00 Shell, 74 10 Shot, 64 Shell, 53 7 Cannon. Shell, 180 f 20 1 „ 35 Kifie. Shell, 96 10 Rifle. Shell, 55 6 Rifle. Muzzle velocity, feet. f 1560 \1160 1,270 i,35o i,330 /1270 11450 1,250 1,200 In projectiles, fuses, small-arms, and equipments generally the naval exhibition was extensive and interesting. The display of offen sive torpedoes was especially worthy of notice, as it included specimens of all the varieties of that class of weapon now under trial. The Lay and Ericsson torpedoes, which remain under the control of the operator during their run; a fish torpedo of the Luppis-Whitehead type; the Harvey torpedo, a similar device, constructed at Goat Island; and the Barber torpedo; and, finally, the Spar topedo, as now supplied to our war vessels, were all shown. The small articles, fuses, key-boards, and Farmer’s dynamo-electric-machine used for firing completed this interesting display. Among the more conspicuous of the private exhibits of the United States in Group XVI. may be mentioned that of the South Boston