. Die Bell System technische Zeitschrift . WWvvWW WTT-GLÜHLAMPE D«y BULBTHUMOMtTtft TnCRMOMCTCR-Rig. 1 – IJridge Circuit of Difference Recorder als zweites konnten die Thermometer nicht gelesen werden, weil sich ihre Stemsin der Kamerakaste befanden. Und daher konnten die gemessenen Luftbefeuchtungen und Tem-Peraturen nicht ermittelt werden, bis die Aufzeichnung entwickelt worden war. t Accordingh, zu dieser Zeit, war gien auf eine Art von Mechanismus in Betracht gezogen, der eine sichtbare Aufzeichnung auf einem Diagramm erzeugen würde, das für die Beobachtung durch den Bediener jederzeit möglich war. Es wurde gefunden, dass die Leeds & Northrup automatische Recorder hatte in com-merci gewesen

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. The Bell System technical journal . WWvvWW WtT BULB D«y BULBTHUMOMtTtft TnCRMOMCTCR rig. 1—IJridge Circuit of Difference Recorder second, the thermometers could not be read because their stemswere within the camera box, and therefore, the humidities and tem-peratures measured could not bo ascertained initil the record hadbeen developed. t Accordingh, at this time, consideration was gien to a type ofmechanism which would produce a visible record upon a chart con-tinuously aailable for observation by the operator. It was foundthat the Leeds & Northrup automatic recorder had been in com-mercial use for some time for the measurement of furnace temperatures, by means of thermocouples in conjunction with an automaticallyadjusted potentiometer circuit. The same tpe of recorder also had HUMIDITY RECOKl^lh^ 241 I <ii. .242 BELL SYSTEM TECHNICAL JOURNAL been used for recording temperatures and differences between twotemperatures by means of resistance thermometers and a Wheatstonebridge arrangement. As it seemed feasible to adapt this instrumentto meet our requirements, the double Wheatstone bridge circuitshown in Fig. 1 and the auxiliary wind tunnel equipment with resist-ance thermometers shown in Fig. 2 were developed. Fig. 3 is anillustration of the Leeds & Northrup recorder used. This recorder was arranged to measure the resistance of the drybulb thermometer and the difference between the resistances of thedry and wet thermometers, and to record these values upon a chart.Referring to the circuit diagram Fig. 1, it may be seen that, by meansof a relay whose operation is controlled by the commutator on therecorder mechanism, the two Wheatstone bridges, one containing thedry bulb thermometer, and the other containing both the dry andwet bulb thermometers, may be balanced alternately by the reco

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• bookcentury1900
• bookdecade1920
• booksubjecttechnology
• bookyear1