Publisher's Synopsis
Excerpt from Contributions to Our Knowledge of the Meteorology of Cape Horn and the West Coast of South America
Further particulars on this subject will be found in the Barometer Manual.* The necessity for this correction is caused by the fact that the mercury in the barometer is expanded by heat, so that the same bulk of mercury is' lighter the higher is its temperature. Accordingly it is only by reducing all the observations to the same temperature that a true idea can be given of the relative pressures at different points on the earth's surface.' The temperature which is always selected is 32� F the melting point'
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