Report of the Chief of Ordnance to the Secretary of WarU.S. Government Printing Office, 1890 |
Otras ediciones - Ver todas
Términos y frases comunes
action of breech Appendix barrel belts bids blank cartridges boilers bolts bore Breech block closed breech mechanism caliber 45 cartridge cast-iron casting cent Chief of Ordnance coil consumption of powder contract cylinder Density Du Pont's Dynamite Gun effect on piece Elastic limit Elevation End of primer feet field butt finished forgings front gas check gauge gear hoops inches diameter iron jacket lathes length machine manufacture metrological data Midvale Steel Company mortar muzzle Object of firing Obturating electric primers Ordnance Department pins plates pounds per square pressure primer blown primer burnt prisms black projectile in flight pulleys purchase rear recoil Record of firing rifle steel ring rotation round Sandy Hook screws shaft shot shrinkage sound of projectile Special remarks specimens spindle sponges square inch straps target Tensile strength thread tion trunnion tube valve velocity Watertown Arsenal Watervliet Arsenal Weight West Point Foundry Wires of primer yards
Pasajes populares
Página 119 - When immediate delivery or performance is required by the public exigency the articles or service required may be procured by open purchase or contract at the places and in the manner in which such articles are usually bought and sold, or such services engaged, between individuals.
Página 119 - Except as otherwise provided by law all purchases and contracts for supplies or services in any of the departments of the Government and purchases of Indian supplies, except for personal services, shall be made by advertising a sufficient time previously for proposals respecting the same, when the public exigencies do not require the immediate delivery of the articles, or performance of the service.
Página 9 - Hereafter the purchase of supplies and the procurement of services for all branches of the Army service may be made in open market, in the manner common among business men, when the aggregate of the amount required does not exceed five hundred dollars; but every such purchase exceeding one hundred dollars shall be promptly reported to the Secretary of War for approval under such regulations as he may prescribe.
Página 119 - That all purchases and contracts for supplies or services in any of the departments of the Government, except for personal services, when the public exigencies do not require the immediate delivery of the article or articles or performance of the service, shall be made by advertising a sufficient time previously for proposals respecting the same.
Página 444 - ... specimens and on the minimum or reduced sections, as measured at the close of the hot tests. From the results it appears that the tensile strength of the steel bars diminishes as the temperature increases from zero Fahr., until a minimum is reached between 200° and 300° Fahr., the milder steels appearing to reach the place of minimum strength at lower temperatures than the higher carbon bars. From the temperature of this first minimum strength the bars display greater tenacity with increase...
Página 8 - Jane 30, 1881, with such remarks and recommendations as the interests of this branch of the military service seem to require. The fiscal resources and expenditures of the department during the year were as follows, viz : Amount in the Treasury to the credit of appropriations on June 30, 1*60.
Página 17 - ... approved March 3, 1885, a board, to consist of the officers and civilians hereinafter named, is appointed to "examine and report at what ports fortifications or other defenses are most urgently required, the character and kind of defenses best adapted for each, with reference to armament,'' and '' the utilization of torpedoes, mines, or other defensive appliances:
Página 449 - STRAINED HOT, AND SUBSEQUENTLY RUPTURED COLD. The effect of straining hot on the subsequent strength cold appears to depend upon the magnitude of the straining force and the temperature in the first instance. There is a zone of temperature in which the effect of hot straining elevates the elastic limit above the applied stress, and above the primitive value, and if the straining force approaches the tensile strength, there is also a material elevation of that value when ruptured cold. These effects...
Página 164 - All iron castings shall be made from a superior quality of gray iron, remelted in the cupola or air-furnace, tough and of even grain, and shall possess a tensile strength of not less than 18,000 pounds per square inch.
Página 450 - When the oxide has a tangible thickness it is more or less loosened from the surface of a ductile metal ruptured cold. Some specimens ruptured after exposure to the lower temperatures of 600° to 700° have had the surface color slightly broken, but such is not generally the case. The fractures of specimens with straw-colored cylindrical surfaces were not colored. Those with blue surfaces showed fractured ends deep straw and brown. The fractures of dark blue and blue-black specimens agreed \vith...