. The Bell System technical journal . 0| BFI \ 0 02 8FI R ( 9 ^ 03 BFI 04 C-CLOCK. SMG- SUBMULTIPLE GENERATOR. S-SPECIAL THREE-WAY SWITCH. 0i,02,03-OSCILLATOR CYCLES. O4-OSCILLATOR 100, FREQUENCY RECORDER. Fig. 18—Schematic of complete frequency standard system. which makes a contact once for each cycle difference between theinput frequencies at A and B and which operates the recordingmechanism I|lh-^h u mt xrr Fig. 19—Balanced modulator of beat frequency indicator. The beat recorder is a counter arranged to count these relayoperati
. The Bell System technical journal . 0| BFI \ 0 02 8FI R ( 9 ^ 03 BFI 04 C-CLOCK. SMG- SUBMULTIPLE GENERATOR. S-SPECIAL THREE-WAY SWITCH. 0i,02,03-OSCILLATOR CYCLES. O4-OSCILLATOR 100, FREQUENCY RECORDER. Fig. 18—Schematic of complete frequency standard system. which makes a contact once for each cycle difference between theinput frequencies at A and B and which operates the recordingmechanism I|lh-^h u mt xrr Fig. 19—Balanced modulator of beat frequency indicator. The beat recorder is a counter arranged to count these relayoperations for a definite time interval, in this case for 1,000 seconds,and then to print the total and reset to zero. Five such units areprovided which print on a wide strip of paper similar to that used in A HIGH PRECISION STANDARD OF FREQUENCY 511 an adding machine. Three of the counters are used as outlined fourth counter is to be used for recording the mean of these threenumbers, computed automatically by an auxiliary device. The re-maining one is a serial counter which is used to record the time,either directly, or by numbering the 1,000 second intervals con-secutively. The five element counter is shown in Fig. 20 with the cover removedto show part of the mechanism. The energy for actuating the countingand resetting mechanism is obtained from a small motor runningcontinuously. These elements are operated at the proper times byclutches c
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
