. Practical physics. Fi. U. The aneroid barometer indicate a change in pressure when they are moved no farther than froma tal)le to the floor. In the self-recording aneroid barometer, or baro-graph, used by the United States \\eather Bureau (Fig. 29), several of theair-tight boxes are superposed for greater sensitiveness, and the jiressuresare i-ecorded in ink upon pajier wound about a drum. Chackwork insidethe drum inakes it revolve once a week. A somewhat different form ofthe instrument is used bv aviators to record altitude. QUESTIONS AND PROBLEMS 1. Why does not the ink run out of a pneiuu
. Practical physics. Fi. U. The aneroid barometer indicate a change in pressure when they are moved no farther than froma tal)le to the floor. In the self-recording aneroid barometer, or baro-graph, used by the United States \\eather Bureau (Fig. 29), several of theair-tight boxes are superposed for greater sensitiveness, and the jiressuresare i-ecorded in ink upon pajier wound about a drum. Chackwork insidethe drum inakes it revolve once a week. A somewhat different form ofthe instrument is used bv aviators to record altitude. QUESTIONS AND PROBLEMS 1. Why does not the ink run out of a pneiuuatic inkstand like thatshown in Fig. 30? 2. If a tumbler is filled, or partly filled, with water, and a jiiece ofwriting pajier is placed over the top, it may be inverted, as in Fig. M,without spilling the water. Explain. What is the function of the paper?. Otto von Glericke (1602-168G) German physicist, astronomei-, and man of affairs; mayor of Mag-deburg; invented the air pump in 1650, and performed manynew experiments with liquids and gases; discovered electrostaticrepulsion; constructed the famous Magdeburg hemispheres whichfour teams of horses could not pull apart (see p. 33) WaterOutlet
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
