Eighth International congress of applied chemistry - Washington and New York, September 4 to 13, 1912 - (1912) (14576984969)

Identifier: eighthinternatio25inte (find matches)
Title: Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... --
Year: 1912 (1910s)
Authors: International Congress of Pure and Applied Chemistry. 8th, Washington, D.C., and New York, 1912
Subjects: Chemistry, Technical Chemistry
Publisher: (Concord, N.H. : The Rumford press)
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: York University - University of Toronto Libraries



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used as standards the various grades ofnitroglycerine dynamite, since it is convenient to express the xxv) Congress of Applied Chemistry 215 strength of a new explosive in terms of these well known grades.It is also possible to use a single standard explosive and to deter-mine the relative strengths of this explosive and the explosivewhich is being tested. We find trinitrotoluol a convenientexplosive for this purpose. The method is to test 10 grams of theexplosive whose strength is being determined against differentweights of trinitrotoluol until a weight of the latter is foundwhich gives the same recoil as 10 grams of the former. If thisweight is 7.5 grams, the new explosive is 0.75 as strong as trini-trotoluol. The Ballistic Mortar is in constant use at the Eastern Labora-tory, averaging possibly a hundred tests a day. Used carefully,with the precautions described above, we find it by far the mostsatisfactory of the tests proposed for the determination of thestrength of explosives.
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METHODS FOR THE DETERMINATION OF THE EF-FECTIVE STRENGTH OF HIGH EXPLOSIVES Arthur M. Coney and Fletcher B. HolmesChester, Pa. The question of the determination of the effective strength ofhigh explosives is more important now than it has been at anytime in the past, because of the many different kinds and gradesof explosives now on the market. In America the multiplica-tion of grades has probably gone on even more rapidly than inEurope. One company sells at the present time about one hun-dred and twenty-five different grades of dynamite, each of whichoffers a particular combination of physical and chemical proper-ties which adapts it, more than any other grade, to a particularkind of work. The proper grading of these dynamites requiresa careful study of the tests available for the purpose. The power of an explosive to move rock depends on two facts:first, that a very small volume of the solid or liquid explosiveforms a very large volume of gas, and second, that this changefrom a smal