The Glycerine Barometer

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Excerpt from The Glycerine Barometer: With Plate and Table of Corrections for TemperatureAlthough the water barometer is an instrument of much interest as a weather glass, it is found to be of little value for indicating with certainty the variations of atmospheric pressure, owing to the effect of temperature on the aqueous vapour above the column, this fact led to the examination of other ¿uids than water for a barometric column, and among those tried glycerine appears to be best suited for the purpose.Glycerine is a substance composed of carbon, hydrogen, and oxygen, its chemical formula being 03h5(oh)3, it occurs in most fixed oils and fats of animal and vegetable origin, and is obtained in large quantities from palm oil and tallow in the process of manufacturing the fatty acids employed by candle makers. It is produced by the action of lime and water on the fats at a' high temperature.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.