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Excerpt from A Manual of the Barometer: Containing an Explanation of the Construction and Method of Using the Mercurial Barometer, With Appropriate Tables for Corrections for Temperature, and Rules for Obtaining the Dew-Point and the Heights of Mountains; To Which Are Added, an Original Table O The curious may amuse themselves with the action of the weight of the atmosphere in the following manner: Take a glass tube of uniform bore, open at both ends; fit a cork to it, and cement a wire into the cork, which will form a piston to the tube; place the piston even with the lower end of the tube; and in that situation place the same end of the tube in mercury; hold the tube steadily and pull up t...