. Electrical world. onged. These systems arebased upon the electrodynamic action of two coils of different diam-eters, the smaller of which is incorporated in the bob of the pendulumand the larger mounted symmetrically beneath the said simultaneously sending currents through these coils in the sameor opposite directions, the pendulum coil may be accelerated re-spectively toward or away from the center of the large coil. Themethods of controlling the accelerating current may be manual orautomatic. From a test made with a i6-ft. pendulum, the resultsobtained would indicate that the p
. Electrical world. onged. These systems arebased upon the electrodynamic action of two coils of different diam-eters, the smaller of which is incorporated in the bob of the pendulumand the larger mounted symmetrically beneath the said simultaneously sending currents through these coils in the sameor opposite directions, the pendulum coil may be accelerated re-spectively toward or away from the center of the large coil. Themethods of controlling the accelerating current may be manual orautomatic. From a test made with a i6-ft. pendulum, the resultsobtained would indicate that the principles of the systems are burden of the paper was to suggest a line of investigation inthis subject to those who have the facilities for swinging pendulumswhose lengths may run up to that of the original one in the Pan-theon at Paris. In a recent communication to the ElectricalWorld .d Engineer, Mr. S. Tideman suggests that the pendulummay be accelerated by raising and lowering the suspension of the. FIG. I.— SUSPENSION TYPE OF FOUCAULT PENDULUM. system when the bob of the same is traveling respectively awayfrom and toward a vertical line passing through the point of sus-pension. While it is known that the suspension of a Foucaultpendulum is the most sensitive portion of the organization, it maybe possible to so accelerate it there that the component of theearths rotation will not be seriously influenced in its action uponthe pendulum. In the present paper the writer begs to suggestseveral designs for carrying out this idea. The first is a mechanicalone, which is adapted to pendulums of moderate length, such asw^uld be employed in general physical laboratory work, while theothers are electrical in character and suitable for pendulum systemsof considerable height, as would obtain in the Pantheon or otherdemonstrations. In all cases the movement of raising and loweringthe suspension is caused to imperceptibly start and stop, the maxi-mum rate of vertic
Size: 1423px × 1756px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
