... Military Commission to Europe in 1855 and 1856: Report of Major Alfred Mordecai, of the Ordnance Department

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G. W. Bowman, printer, 1860 - 232 pàgines
 

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Pàgina 59 - SIR : I am commanded by my lords commissioners of the admiralty to send you herewith, for the information of Earl Russell, a copy of a letter from...
Pàgina 119 - ... ball between two screens placed at a short distance from each other on the path of the projectile. For this purpose the observer is provided with a revolving cylinder, moved by clock-work at the rate of at least ten turns in a second, and of which the convex surface is divided into a hundred equal parts, each part therefore indicating in the revolution the thousandth part of a second. Close to the surface of this cylinder, which revolves horizontally, are placed two galvanometers, one at each...
Pàgina 191 - Calvinism, it can easily be demonstrated that during the second half of the sixteenth century and the first half of the seventeenth century...
Pàgina 119 - The plan proposed for this purpose consisted in the application of the instantaneous transmission of the electrical action to determine the time of the passage of the ball between two screens, placed at a short distance from each other in the path of the projectile. For this purpose the observer is provided with a revolving cylinder moving by clock-work at a uniform rate, and of which the convex surface is divided into equal parts indicating a fractional part of a second. The passage of the ball...
Pàgina 119 - ... ink on the revolving surface. To give motion to the needles at the proper 'moment, each galvanometer is made to form a part of the circuit of a galvanic current, which is completed by a long copper wire passing to one of the screens, and crossing it several times, so as to form a grating, through which the ball cannot pass without breaking the wire, and thus stopping the current. During the continuance of the galvanic action, the marking end of the needle is turned from the revolving cylinder...
Pàgina 176 - Rifled infantry arms. A brief description of the modern system of small arms, as adopted in the various European armies. By J. Schon, captain in the Royal Saxon infantry . 2d ed., revised and augmented.
Pàgina 42 - The candidate must be not less than sixteen years of age, and must be able to pass an examination in...
Pàgina 119 - After the discharge these needles were found to be magnetized in different directions, according to their size and hardness. In one of his numerous communications presented to the Philosophical Society he appears as one of the inventors of the electrochronograph. On May 30, 1843, he presented and read a communication on a new method of determining the velocity of projectiles. It -was in its essential parts identical with that now generally adopted. It consisted, he says, in applying the instantaneous...
Pàgina 205 - This elliptical bore had an increasing twist and a diminished cross section as it approached the muzzle; the smaller axis, which is to be regarded as the caliber, being 0.543 inch at the breech, and 0.540 inch at the muzzle; while the greater axis, which takes the place of the grooves, was 0.557 inch at the breech, and 0.543 inch at the muzzle. The twist was half a turn in the length of the bore. The ball was cylindro-spherical in shape, 1.125 inch long, and 0.532 inch in diameter.
Pàgina 205 - ... The barrel had a caliber of 0.621 inch, and one of the several kinds of balls weighed nineteen to the pound. 6. Richard's rifle was equally unsuccessful. The caliber was 0.577 inch, and the ball weighed twenty-four to the pound. 7. Lancaster's rifle, which differed from all the others in the peculiar construction of the bore. It was 39 inches long, and had no grooves; but was smoothly and elliptically bored out. This elliptical bore had an increasing twist and a diminished cross-section as it...

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