true melting points of metals

FUZE POWDER. 289 Fourthly, the slow-burning fuze naturally demands a stronger initial-ignition. This principle was first established by the re- searches of the K. u. K. Technical Military Committee, since several fuzes were rejected by them as unignitable, which ignited without delay at the powder factory; so a remedy was grasped at, and the beginning of the powder column of such a fuze was supplied with a quicker burning mixture. Particularly the powder containing graphite was treated in that manner, which seemed best to suit that powder. The old method of assuring the retention arid transmission of fire by a complicated arrangement of quick-matches has for- tunately been dropped and replaced by cylinders of compressed powder. But in order to offer still fewer sources of error, the orifices through which the fire is propagated should be filled with the finest grained powder. At any rate the elimination of quick- matches, and their replacement by loosely poured in powder, which is held in place by tin foil, seems to best meet the require- ments, according to the investigations of the K. u. K. Powder Factory. True Melting Points of Metals. M. VOl~ PIRANI (Ber. Phys. Ges., cccx, 48.)--The equivalent in black-body temperatures of metal surfaces is ascertaified b~y optical pyrometry. To obtain the true temperature, Pirani uses the electrical resistance as an intermediate check, since this is not affected by surface conditions. The chief work was done on tungsten and tantalum. Taking the melting point of platinum as 1788 ° C., that of tantalum is 31oo ° and tungsten 335 ° C. Ferro-Molybdenum Made by the Thermit Process. (Eng, and Min. Jrnal., xc, 6.)--Ferro-molybdenum is now produced by the Thermit process and is ~oming into general use as a valuable alloy in high grade steels. Until lately pure molybdenum only was produced by this process, but to supply a demand, ferro-molybdenum is now being manufactured. The advantage Of ferro-molybdenum over metallic molybdenum is that it does not oxidize, and that it can be more easily alloyed wit b steel, owing to its lower melting- point. Tensile Strength of Aluminum Zinc Alloys. W. D. BAN- CROFT. (Mech. Eng., xxv, 329.)--The alloys were made by melting 99.9 per cent. pure aluminum with " Bertha Pure Zinc " which had

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FUZE POWDER. 289

Fourthly, the slow-burning fuze naturally demands a stronger initial-ignition. This principle was first established by the re- searches of the K. u. K. Technical Military Committee, since several fuzes were rejected by them as unignitable, which ignited without delay at the powder factory; so a remedy was grasped at, and the beginning of the powder column of such a fuze was supplied with a quicker burning mixture. Particularly the powder containing graphite was treated in that manner, which seemed best to suit that powder.

The old method of assuring the retention arid transmission of fire by a complicated arrangement of quick-matches has for- tunately been dropped and replaced by cylinders of compressed powder. But in order to offer still fewer sources of error, the orifices through which the fire is propagated should be filled with the finest grained powder. At any rate the elimination of quick- matches, and their replacement by loosely poured in powder, which is held in place by tin foil, seems to best meet the require- ments, according to the investigations of the K. u. K. Powder Factory.

True Melting Points of Metals. M. VOl~ PIRANI (Ber. Phys. Ges., cccx, 48.)--The equivalent in black-body temperatures of metal surfaces is ascertaified b~y optical pyrometry. To obtain the true temperature, Pirani uses the electrical resistance as an intermediate check, since this is not affected by surface conditions. The chief work was done on tungsten and tantalum. Taking the melting point of platinum as 1788 ° C., that of tantalum is 31oo ° and tungsten 335 ° C.

Ferro-Molybdenum Made by the Thermit Process. (Eng, and Min. Jrnal., xc, 6.)--Ferro-molybdenum is now produced by the Thermit process and is ~oming into general use as a valuable alloy in high grade steels. Until lately pure molybdenum only was produced by this process, but to supply a demand, ferro-molybdenum is now being manufactured. The advantage Of ferro-molybdenum over metallic molybdenum is that it does not oxidize, and that it can be more easily alloyed wit b steel, owing to its lower melting- point.

Tensile Strength of Aluminum Zinc Alloys. W. D. BAN- CROFT. (Mech. Eng., xxv, 329.)--The alloys were made by melting 99.9 per cent. pure aluminum with " Bertha Pure Zinc " which had

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Melting metals process

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