Evening Republican, Volume 23, Number 228, Rensselaer, Jasper County, 21 September 1920 — Weighing a Perfume. [ARTICLE]

Weighing a Perfume.

It was the Italian physicist Balvioni who devised a microbalance of such eartreme delicacy that it clearly demonstrates the loss of weight of musk by volatilisation. Thus the invisible perfume floating off in the air is ~tndlrectly weighed. The essential part of the apparatus is a very thin thread of glass fixed at one end and .extended herlsontally. The microscopic objects to be weighed are placed upon the glass thread near Its free end and the amount of iexure produced Is observed with a mlscroscOpe magnifying 100 diameters. A mote weighing onethousandth of a milligram perceptibly bends the thread. Isinglass. Wteglan Is the dried swimming bladders of several varieties of fish. The amount of gelatin In isinglass Is 86 to 98 per cent and evengnore. It is prepared by tearing die air bladder or sound from die back of the fish, from which it has been loosened by striking several blows with a wooden ’dub, then washing In cold water. The black outer skin Is removed with a fcnlffe, again washed and spread on a board to dry In the open air, with the white shiny skin turned outward. TO prevent shriveling or shrinking the Madders must be fastened to a drying board. The best quality of isinglass comes from sounds that are dried in the sun. .After drying the sound Is again moistened with warm water and, the interior shiny skin Is removed by hammering or rubbing. Finally it is rolled between two polished iron rollWR ■ । i;,- ~ - 1 ' “