. The Pharmaceutical era . 1 of Standard Metre. In 1878 the scientific instruments were installed, thJBstaff nominated and all ready for Standard Metre of 1799 was In pure platinum, but St. Claire Deville pro-posed an alloy of 9 parts of platinum to one of this metal costs about ?twO per pound, it was import-ant to choose a form sufficiently rigid yet economical ofmetal. The section sketched in the margin was designedby Tresca, and adopted as the best. The standards were cast by Matthey, of London,straightened and polished by Brunner Bros., of Paris,and traced at the Paris
. The Pharmaceutical era . 1 of Standard Metre. In 1878 the scientific instruments were installed, thJBstaff nominated and all ready for Standard Metre of 1799 was In pure platinum, but St. Claire Deville pro-posed an alloy of 9 parts of platinum to one of this metal costs about ?twO per pound, it was import-ant to choose a form sufficiently rigid yet economical ofmetal. The section sketched in the margin was designedby Tresca, and adopted as the best. The standards were cast by Matthey, of London,straightened and polished by Brunner Bros., of Paris,and traced at the Paris Technical School (Arts and. JEAN SERVAIS ). Pages would be rerulred to describe theminute care with which the precious bars of metal weremeasured and compared; plunged in water kept at aneven temperature, (as four thermometers, one at eachcorner of the tank, attested); ruled under a microscope, etc. Suffice it to say that the maximum differencebetween the original and the longest and shortest ofthe thirty standards was three microns* The onenearest in length to the original standard of 1799 waskept by the French Government as the InternationalStandard Metre; for the other twenty-nine lots weredrawn by the representatives of the various nations. The Kilois perhaps more interesting to pharmacists than theMetre. As M. Gulllaume, of the International Bureau,writes: Weighingis perhaps the most delicate opera-tion In Physics, owing to the marvelous sensibility ofscales. The slightest variation in temperature, themovement of a heavy mass in proximity, not to speakof the microscopic dust which hangs to
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Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
