The Artillerist's Manual

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D.Van Nostrand, 1860 - Artillery - 568 pages
 

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Page 76 - ... laying on the bottom of the bore a strip of wood with a groove on the under side containing a strand of quick-match by which fire is communicated to the charge ; in a brass gun take out some of the metal at the upper orifice of the vent, and pour sulphuric acid into the groove for some hours before firing.
Page 247 - The piece, however, should be fired with as little delay as possible, as the vapor would diminish the strength of the powder. FURNACES FOR HEATING SHOT are erected at the forts on the sea-coast. These furnaces hold sixty or more shot. The shot being placed, and the furnace cold, it requires one hour and fifteen minutes to heat them to a red heat ; but after the furnace is once heated, a 24-pdr. shot is brought to a red heat in twenty-five minutes ; the 32-pdr. and 42-pdr. shot require a few minutes...
Page 377 - The central nippers will have attained nearly their full growth. A vacuity will be left where the second stood, or they will begin to peep above the gum, and the corner ones will be diminished in breadth, worn down, and the mark becoming small and faint. At this period, too, the second pair of grinders will be shed.
Page 376 - At the age of one year and a-half, the mark in the central nippers will be much shorter and fainter ; that in the two other pairs will have undergone an evident change, and all the nippers will be flat. At two years this will be more manifest. The accompanying cut (Fig.
Page 105 - ... age, or the date of receiving them. The piles should be taken down, and made over again at intervals, varying with the length of time which the timber has been cut. The seasoning of timber requires from two to four years, according to its size. Gradual drying and seasoning in this manner is considered the most favorable to the durability and strength of timber, but various methods have been proposed for hastening the process. For this purpose, steaming or boiling timber has been applied with...
Page 35 - ... each. There should be an unencumbered space of 6 or 8 feet at the door or doors of the magazine. Should it be necessary to pile the barrels more than four tiers high, the upper tiers should be supported by a frame resting on the floor; or the barrels may be placed on their heads with boards between the tiers. Besides being recorded in the magazine book, each parcel of powder should be inscribed on a ticket attached to the pile, showing the entries and the issues. For the preservation of the powder...
Page 305 - The scale passes through a slit in a piece of steel, with which it is connected by a screw, forming a pivot on which the scale can vibrate laterally. This piece of steel terminates in pivots, by means of which the pendulum is supported on the seat attached to the gun, and is at liberty to vibrate in the direction of the axis of the piece. The seat is of...
Page 104 - For the purpose of seasoning, timber should be piled under shelter, where it may be kept dry, but not exposed to a strong current of air ; at the same time, there should be a free circulation of air about the timber, with which view...
Page 35 - The magazine yard should be paved and well drained. The moisture of a magazine may be absorbed by chloride of lime suspended in an open box under the arch, and renewed from time to time ; quicklime is dangerous, and should not be used. The sentinel or guard at a magazine, when it is open, should have no fire-arms, and every one who enters the magazine should take off his shoes, or put socks over them; no sword or cane, or anything which might occasion sparks, should be carried in. The windows should...
Page 35 - ... than that inside the magazine. It should not be opened in damp weather if it can be avoided. The ventilators must be kept free; no shrubbery or trees should be allowed to grow so near as to protect the building from the sun. The magazine yard should...

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