. The Bell System technical journal . I —Holding relayj —Frequency lamp relayk—Main control relay/ —Plate motor remain a few details having to do with assembly, control, etc., thatmay be of interest. Fig. 5 shows the analyzer as completed and ready to operate. Theapparatus is assembled on a two-deck, structural-steel table equip-ped with castors for convenience in handling. Much of the equip-ment is inclosed for protection against moisture and dust. Therecording meter, camera motor, amplifier-rectifier, control relays,and input and tuned circuits are placed on the top. Below are 3
. The Bell System technical journal . I —Holding relayj —Frequency lamp relayk—Main control relay/ —Plate motor remain a few details having to do with assembly, control, etc., thatmay be of interest. Fig. 5 shows the analyzer as completed and ready to operate. Theapparatus is assembled on a two-deck, structural-steel table equip-ped with castors for convenience in handling. Much of the equip-ment is inclosed for protection against moisture and dust. Therecording meter, camera motor, amplifier-rectifier, control relays,and input and tuned circuits are placed on the top. Below are 310 BELL SYSTEM JOURNAL mounted the batteries, the vacuum pump with its motor, and thetracker bar with paper roll mechanism. The arrangement is clearlyshown in Figs. 6 and 7 taken with the protecting panels remo\ Fig. 6, a is a moisture-proof box containing the input and tunedcircuits. The inductance coil is placed in the center of the upperhalf of this bo.\ together with the switch for connecting the^windings. \ic\v of Analyzer with Ilimp Side Uncovered a—Input and tuned circuits B—.iplificr-rcrtificr c—Source-alternating relay d—Recording meter E—Paper roll / —Plate batteryn—Pump motorQ—Reversing solenoid/ —Series-parallel coil switchI —Vacuum [)unip-Tracker har in scries or parallel. The smaller ca|)acitaiices are of mica and arearranged around the coil and switch assembly in such a way thatthey may be connected with a minimum length Oi lead to the airrelays which arelocated on one side of tlir box. The larger capac-itance units are made up of paper condensers and are placed in thelower half of the box. The metal linetl box h contains the amplifier-rectifier, and at d is shown the recording meter. Box e contains thecontrol circuits with the necessary relays. The method of mount-ing the air relays, main vacuum header (attached to underside of MN ELECTRICAL FREQUENCY ASALYZER 311 table top), air motor, etc., is also clearly shown in
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
