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1%-inch ring 3-inch shrapnel 48 inches Applied loads Arsenal from bar band groove bar stock bourrelet Cast iron cent Charpy impact test chromium Depth inside Diameter of piston Diameter of wire Distance along bore edge of band Elastic limit Elongation in 48 entered testing cylinder Exterior diameter Fiber stress Forged steel Frankford Arsenal friction load grains grease heat treatment HYDROSTATIC TEST inch chain inches from end inches inside diameter Interior pressure pounds interval seconds Kind of links l\-inch Laconia Length from top length of reduced link fractured links before testing links were examined loads pounds longitudinal Marks on specimen martensite metal mini Minimum Oil quenched PartB PHOTOGRAPH pounds per square pounds the length pounds the links pounds the width Projectile quenched from 770 Savage Arms Sectional area sorbitic tangential Tensile strength thickness of walls tion top to top Velocity inches WATERTOWN ARSENAL Weight Width of lmks
Page 3 - SPEAKER OF THE HOUSE OP ^REPRESENTATIVES. SIR : I have the honor to transmit herewith a letter from the Acting Chief of Ordnance...
Page 210 - ... of many gun fragments, and in trepanned guns, the characteristic martensitic structure has been missing. In some experimental steels which had been subjected to erosion tests by allowing the gas of an ignited charge of powder to escape through a tube of the metal, there...
Page 152 - Elongation, 27 per cent. Contraction, 46.2 per cent. FIG. 9. Cast steel, cooled in air from 1 ,500° F. Elastic limit, 49,500 pounds per square inch. Tensile strength, 81,000 pounds per square inch. Elongation, 15.5 per cent.
Page 136 - Heat No. Tanks represented by test (serial Nos.) Elastic limit (pounds per square inch) Tensile strength (pounds per square inch) Elongation (percent in 2 inches) Reduction of area (percent) Serial Nos. of tanks Actual test pressure (pounds per square inch) Total expansion (cubic centimeters) Permanent expansion (cubic centimeters) Percent ratio of permanent expansion to total expansion...
Page 190 - THERMOELECTRIC PYROMETER. Principle. — The junction of two metals heated to a given temperature is the seat of an electromotive force which is a function of the temperature only, at least under certain conditions which we shall define further on. In a circuit including several different junctions at different temperatures the total electromotive force is equal to their algebraic sum. In a closed circuit there is produced a current equal to the quotient of this resultant electromotive...
Page 206 - Inasmuch as the number of specimens was very large, it was decided to select at random various specimens. In some cases portions of all test pieces submitted from a particular gun were examined, and in other cases random specimens illustrating successful and unsuccessful physical tests were examined.
Page 42 - ... In all tests except the first the projectile bumped more or less while passing through the bore. This bumping was very marked on bands Nos. 2, 4, and 5, probably due to the copper deposit on lands. Cleaning with a wire brush to remove this deposit decreased the bumping considerably.
Page 14 - ... thickness of wall was a minimum. At this point the rotating band exerted a reinforcing effect which could not be measured. Third. The reduced section was reinforced on both sides by thicker metal. CONCLUSIONS. 1. Streaks in shrapnel cases made of bar stock are an indication of weakness. 2. Shrapnel cases made from forgings are stronger than those made from bar stock. •Streaks 6-INCH SHRAPNEL CASE A MADE FROM BAR STOCK. PO 128 FA POLISHED AND ETCHED WITH IODINE. DARK LINES IN CENTER OF CASE...
Page 136 - ... from 5.7 to 20.5 per cent. CONCLUSIONS. 1. Specimens taken normal to the direction of forging are lower in all physical properties than those taken along the direction of forging. The ductility is more sensitive in this respect than the elastic limit and tensile strength. 2. Longitudinal specimens are much more uniform than those taken normal to the direction of forging. EXPERIMENTS ON HEAT TREATMENT OF STEEL. 59136°— 15 10 145 HEAT TBEATMENT OF NICKEL VANADIUM STEEI.