. The Bell System technical journal . Fig. 14—Rapid record oscillograph. Front pole face of galvanometer. Terminalsfor the three-string elements are brought to knife contacts, which allows the stringmounting and pole piece to be readily removed from the galvanometer. Both motors having been started, operation of the oscillograph iscommenced by pulling out a lever which withdraws a knife blade fromthe paper, and moves an idler pulley, which presses the paper againstthe main drive roll. The paper is then run through the storage tank,and the developing and fixing tanks as already described. After
. The Bell System technical journal . Fig. 14—Rapid record oscillograph. Front pole face of galvanometer. Terminalsfor the three-string elements are brought to knife contacts, which allows the stringmounting and pole piece to be readily removed from the galvanometer. Both motors having been started, operation of the oscillograph iscommenced by pulling out a lever which withdraws a knife blade fromthe paper, and moves an idler pulley, which presses the paper againstthe main drive roll. The paper is then run through the storage tank,and the developing and fixing tanks as already described. After the AN OSCILLOGRAPH FOR TEN THOUSAND CYCLES 89. 90 BELL SYSTEM TECHNICAL JOURNAL events under observation have been recorded the starting lever ispushed back, withdrawing the idler pulley from the main drive roll,and releasing the knife, which cuts off the exposed section of electromagnetic brake, operated by a timing control circuit, ismomentarily applied to the spinning roll of paper, and stops it in afraction of a revolution. The exposed paper continues to pass throughthe developing and fixing tanks, and into the rinsing tank until it hasall been developed. A view of the machine with the developing andfixing tanks dropped for inspection of the mechanism is shown inFig. 12. A solenoid may be provided for operating the machine froma distance when desired. The complete galvanometer element of the three-string model isshown in Fig. 13, and one pole piece and the string mounting, in Fig. 14. As an illustration of the many uses of the new oscillograph, an oscil-logram is given in Fig. 15, which shows the wave form of the soun
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
