. The Bell System technical journal . 102 + 13 69 -20 14 89 95 +6 103 + 14 69 -20 13 89 95 +6 102 + 13 69 -20 12 89 94 +5 103 + 14 70 -19 11 89 95 +6 103 + 14 69 -20 10 90 95 +5 103 + 13 71 -19 9 89 95 +6 103 + 14 70 -19 8 89 95 +6 103 + 14 69 -20 7 89 94 +5 103 + 14 70 -19 by a, b, and c respectively, it can be shown readily that the numbers a -\- h -\- c , a -\- h -\- c a + 6 + c , a -{- h -\- c ,_. O -A . o ;; , c and (7) 4 4 4 4 ^ ^ represent the difference between each of the oscillators Nos. 1, 2, 3and 4 respectively and the mean of all four, expressed in parts, inone hundred million. Th
. The Bell System technical journal . 102 + 13 69 -20 14 89 95 +6 103 + 14 69 -20 13 89 95 +6 102 + 13 69 -20 12 89 94 +5 103 + 14 70 -19 11 89 95 +6 103 + 14 69 -20 10 90 95 +5 103 + 13 71 -19 9 89 95 +6 103 + 14 70 -19 8 89 95 +6 103 + 14 69 -20 7 89 94 +5 103 + 14 70 -19 by a, b, and c respectively, it can be shown readily that the numbers a -\- h -\- c , a -\- h -\- c a + 6 + c , a -{- h -\- c ,_. O -A . o ;; , c and (7) 4 4 4 4 ^ ^ represent the difference between each of the oscillators Nos. 1, 2, 3and 4 respectively and the mean of all four, expressed in parts, inone hundred million. This method treats all four oscillators sym-metrically. The symmetry is evident if we substitute in (7) thevalues (2) assigned to a, b, and c, whence we get: A HIGH PRECISION STANDARD OF FREQUENCY ^ - ^ + f + ^ ^ 1,000 (f^ +/^ t/3 +f^_f^) , ^ _ a-hb + c ^ j^QQQ I -^^ •■ :- - /2 ) , V 4 (^ + /2 + /3 + /4 \ 4 (^^ + /2 + /3 + /4 \ 4 (Ir+h + /3 + /4 c - ^ + ? ^ ^ = 1,000 ( \ - -h ) , ^ + f + ^ = 1,000 (-^^ y - /4 ). 509(8) (9)(10) (11). Fig. 17—Four 100,000-cycle oscillators with auxiliary equipment. The four oscillators used in the equipment described are shown inFig. 17. The panels on which the controlling and measuring circuitsare mounted are at the right of the picture. The 1,000-cycle motor-driven clock is at the top of the nearest panel. A schematic of theapparatus showing the general arrangement of parts is given inFig. 18. 510 BELL SYSTEM TECHNICAL JOURNAL The circuit of one element of the modulator for producing low-frequency beats is shown in Fig. 19. The input circuits A and Bare supplied from oscillator No. 4 and one of the other three, respec-tively. The plate circuit includes the windings of a balanced relay
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
