. Scientific American Volume 91 Number 09 (August 1904). iage ready for firing. Asimilar exhibit is made of a Colt automatic machinegun. Nearby there are a 3-inch rapid-fire field gun,a Vickers-Maxim automatic gun, and two Gatling guns,all mounted on their respective carriages. A particu-larly interesting feature is a series of fifteen ma-chines, shown in operation, making ball cartridges forthe army rifle. The Springfield armory exhibits, ina very interesting display, the development of portable A paper was read at the last meeting of the ParisAcademy of Sciences on The Action of TerrestrialM
. Scientific American Volume 91 Number 09 (August 1904). iage ready for firing. Asimilar exhibit is made of a Colt automatic machinegun. Nearby there are a 3-inch rapid-fire field gun,a Vickers-Maxim automatic gun, and two Gatling guns,all mounted on their respective carriages. A particu-larly interesting feature is a series of fifteen ma-chines, shown in operation, making ball cartridges forthe army rifle. The Springfield armory exhibits, ina very interesting display, the development of portable A paper was read at the last meeting of the ParisAcademy of Sciences on The Action of TerrestrialMagnetism upon a Tube of Nickel Steel (Invar) In-tended for Use as a Geodetic Pendulum, by M. The alloy of nickel and iron known as invar,which possesses a coefficient of expansion only one-twentieth that of brass, has obvious advantages forpendulum observations. This steel, however, is mag-netic, and it was thought possible that the disturbinginfluence introduced in this way might be too largeto be neglected. The magnetic moment of a tube of. Model of 16-inch Army Gun, with Row of Projectiles and Powder Charges for 6-inch to 12-inch Guns. Weight of 16-inch Gun is 130 Tons; Muzzle Velocity, 23,000 feet per Second, and Maximum Range 21 Miles. UNITED STATES WAR DEPARTMENT EXHIBIT AT ST. LOUIS FAIR. in war-time operations. The outside exhibit also in^eludes the famous 12-inch Krupp plate which wassmashed to pieces in the recent attack upon it by highexplosive shells filled with maximite and dunnite. The most striking feature of the indoor exhibit ofthe War Department is an exact model of the great16-inch coast-defense gun which was tested recentlyat Sandy Hook. This gun, which weighs 130 tons,throws a 2,400-pound shell with a. muzzle velocity of2,300 feet a second. If it were set up at the Batteryand fired with an elevation of 45 degrees, the shell firearms, from a small iron tube fired from a supportby means of a lighted match held in the hand, to thelatest pattern of a
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