Report of the tests of metals and other materials for industrial purposes made with the United States testing machine at Watertown Arsenal, Massachusetts, during the year ended ...

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G.P.O., 1915 - Architecture
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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 5 - Congress as required by law, copy of the report of the commanding officer of Watertown Arsenal, of "Tests of iron and steel and other material for industrial purposes," made at that arsenal during the fiscal year ended June 30, 1906.
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.

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