. Engineering and Contracting . ets of the receiving instrument by the alternatingcurrent generated by the action of the ringer. The slightlyincreased line resistance offered by the impedance coil isadjusted at the lamp bank on the power line. Small con-densers inserted in series with the call bells of each tele-phone prevent the possibility of the impulses from thesender crossing through the call bell circuit to operate thewrong set of magnets of the receiving instrument. Although this arrangement of the long distance water-stage recorder at Topeka is a typical installation, severalmodificati
. Engineering and Contracting . ets of the receiving instrument by the alternatingcurrent generated by the action of the ringer. The slightlyincreased line resistance offered by the impedance coil isadjusted at the lamp bank on the power line. Small con-densers inserted in series with the call bells of each tele-phone prevent the possibility of the impulses from thesender crossing through the call bell circuit to operate thewrong set of magnets of the receiving instrument. Although this arrangement of the long distance water-stage recorder at Topeka is a typical installation, severalmodifications of this type of recorder are possible. The recording gage may be replaced by an indicating dialwith a moving pointer that is operated by the electro-mag-nets and the ratchet wheel in the same manner as the re-corder. The dial shows the stage at the distant observa-tion station at any instant. Several recording gages and indicating dials located atvarious points on the long distance circuit may be operatedby the same Sending Instrument. Receiving: Instrument. Side Long Distance Water Stage Recorder, Itecpiving Instrument. Front View. indicating gage for recording the gage heights in the stillingwell. The wheel is 1 ft. in circumference and is divided into100 parts, and the feet may be read conveniently on a receiving instrument used at Topeka is a Gurley 7-day water-stage recorder, modified so that the record cylinderis operated by magnets Instead of directly by the float. Thedrum is turned by means of gears and a rachet wheel is (146) Many combinations of these instruments may be workedout in connection with the operation and regulation of watersupply systems, hydro-electric power plants, or other enter-prises, and the recording gages or indicating dials concen-trated at a central station where the performance of the in-terrelated units may be readily observed and effectively con-trolled. Engineering and Contracting for June 9, 1920. 649 Pro
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