Fields of force; supplementary lectures, applications to meteorology; . Fig. 1. electric motor, or any other suitable source, for motive use of the crank has the advantage that the amplitudes of theoscillations of the springs are invariable and independent of theresistance to the motion. It should be noted here, that, with thecrank, the springs may be used simply as rigid levers, by loosen-ing the screws, m, which hold them in the base. The springs arethen free to turn about a pivot just below the screws. A hydraulic motor might also be used to drive the coaxial brass c
Fields of force; supplementary lectures, applications to meteorology; . Fig. 1. electric motor, or any other suitable source, for motive use of the crank has the advantage that the amplitudes of theoscillations of the springs are invariable and independent of theresistance to the motion. It should be noted here, that, with thecrank, the springs may be used simply as rigid levers, by loosen-ing the screws, m, which hold them in the base. The springs arethen free to turn about a pivot just below the screws. A hydraulic motor might also be used to drive the coaxial brass cylinders, open at the same end, are so ar-ranged that the inner projects slightly beyond the outer. A rubbermembrane is stretched over the open ends of the two tubes, so 16 FIELDS OF FORCE. that water admitted to the outer cylinder cannot pass into theinner cylinder without pressing out the membrane. Under suita-ble circumstances, this produces a vibration of the membrane, \1 u Fig. 2. h d. Fig. 3. which can be communicated to the pumps by the period will depend upon the tension of the membrane, the INVESTIGATION OF GEOMETRIC PROIEETIEH. 17 stiffness of the springs, and the length and section of the dis-charge-pipe. An electromagnetic vibrator is often convenient fordriving the generator. 13. Pulsalor. Oscillator. — For a pulsating body we may usean india-rubber balloon attached to one end of a metal tube, theother end of which is connected by a rubber tube with one ofthe pumps of the generator. As the balloon often takes irregularforms and motions, it is usually more convenient to let the tubeend in a drum, which is covered on each side with a rubbermembrane. A diagram is given in Fig. 2. A convenient form of oscillator is shown in Fig. 3. The oscil-lating body is a hollow celluloid sphere, a, made in two halves,and attached to a tube of the same material, b, which reachesabove the surface of the water. A metal tube, c, connected withone pump of th
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