. Electrical world. rhaps one of the most inter-esting experiments that physics affords, for it demonstrates to theobserver the absolute revolution in space of the earth; not thatrelative motion which one sees when looking at the firmament on aclear night, but a positive turning of the earth in a certain directionwith respect to the celestial sphere. The repetition of Foucaultspendulum demonstration in the Pantheon by M. Camille Flam-marion, approximately fifty years after the original, has renewedthe interest in the same, and has influenced physicists about theworld to again carry out the exp
. Electrical world. rhaps one of the most inter-esting experiments that physics affords, for it demonstrates to theobserver the absolute revolution in space of the earth; not thatrelative motion which one sees when looking at the firmament on aclear night, but a positive turning of the earth in a certain directionwith respect to the celestial sphere. The repetition of Foucaultspendulum demonstration in the Pantheon by M. Camille Flam-marion, approximately fifty years after the original, has renewedthe interest in the same, and has influenced physicists about theworld to again carry out the experiment. The pendulum, however,is limited by the fact that in the course of a short time, dependingupon the length of the vibrating system, the oscillations cease. To overcome this disadvantage and thereby provide a means ofprolonging the motion of the pendulum, or maintaining the samein constant vibration, are the purposes of the accompanying sensitiveness of a Foucault pendulum is well known, but it is. ^_^ J FIG. 1.—KEY-CONTROLLED TYPE OF FOUCAULT PENDULUM. believed that, under suitable conditions, the acceleration may besatisfactorily accomplished, the present designs being herewith pre-sented, both as suggestions for a line of laboratory investigation inthis subject, and as convenient adjuncts in physical lectures orother demonstrations. The accelerating principle of the systems isbased upon the electrodynamic action of two coils of different di-ameters, the smaller of which is incorporated in the bob of thependulum, while the larger is mounted beneath and symmetricallywith respect to the aforesaid pendulum. When direct or alternatingcurrents are allowed to simultaneously flow in the two coils in thesame direction, it has been found by experiment that the pendulumcoil is urged toward the center of the largr coil. This action takesplace in whatever plane of oscillation th. pendulum coil vibrates,and is strongest when the said coil is directly over a portion of
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
