. Electrical world. , 88, mounted uponthe frame plate, 49, by a fibre block, 89, together with several screws. 90 and 91. From the property of the differential adjustment, whenthe worm, 81, is revolved by turning the knurled member, 83, thecontact wheel, 86, may be adjusted, while running, until the impulsesof current, which are sent to the pendulum accelerating coils, 24 and28, are in proper step with the vibrations of the Foucault pendulumsystem. When desired a dial, 92, may be mounted upon the frameplate, 49, of the movement, an opening being provided in the said dial,92, for the contact sp
. Electrical world. , 88, mounted uponthe frame plate, 49, by a fibre block, 89, together with several screws. 90 and 91. From the property of the differential adjustment, whenthe worm, 81, is revolved by turning the knurled member, 83, thecontact wheel, 86, may be adjusted, while running, until the impulsesof current, which are sent to the pendulum accelerating coils, 24 and28, are in proper step with the vibrations of the Foucault pendulumsystem. When desired a dial, 92, may be mounted upon the frameplate, 49, of the movement, an opening being provided in the said dial,92, for the contact spring, 88, to pass therethrough. For enabling the mechanism to control pendulums of differentlengths, it is intended that a number of contact wheels, similar tothat numbered 86, but having varying numbers of insulated rodsdriven into their peripheries, shall be employed. Thus, if the Fou-cault pendulum makes one beat per second, the electrical contact,while the pendulum coil. 24. is traveling toward the center of the. FIG. 5.—CONTACT ADJi;STMENT OF SYNCHRONOUS TYPE. stationary coil, 28, should last .5 second, and there will be sixtycontacts, together with an equal number of insulating spaces uponthe periphery of the contact wheel. For a pendulum having a beatof seconds, the contact should last .75 second, and there willbe forty fibre rods in the contact wheel. If the pendulum makes avibration in two seconds, the electrical contact will have a durationof one second, and there will be thirty fibre rods in the contact a beat of seconds for the pendulum, the contact will last!.25 second, and there will be twentj-four fibre rods in the contactwheel. For a pendulum making as oscillation in 5 seconds, thecontact will last seconds, and the contact wheel should havetwelve fibre segments. With a pendulum making a vibration in , the contact should last seconds, and there will beeight insulating rods in the periphery of the contact wheel. Bybeing able
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
