. The Bell System technical journal . 3. Pt= WATTS Ta= 382 ° C 4. Pj = WATTS Ta=438°C. -L i^S 1 iS ^^B 1 T . I* i Hi ^r \Mm Pt = WATTS Ta=525 Pt = WATTS 556°C Fig. 78.—A series of x-ray photographs of the thermal tuning mechanism of an operating2K45. These show the motion of the bows for successively increasing power inputs tothe tuner channel. to sustain/„. \\e say that the control is positive if no overshoot occurs, ,if the frequency does not continue to change for a time and then return to REFLEX OSCILLATORS 583 fa ■ ^^ e might equally well have illustrated this by an ex
. The Bell System technical journal . 3. Pt= WATTS Ta= 382 ° C 4. Pj = WATTS Ta=438°C. -L i^S 1 iS ^^B 1 T . I* i Hi ^r \Mm Pt = WATTS Ta=525 Pt = WATTS 556°C Fig. 78.—A series of x-ray photographs of the thermal tuning mechanism of an operating2K45. These show the motion of the bows for successively increasing power inputs tothe tuner channel. to sustain/„. \\e say that the control is positive if no overshoot occurs, ,if the frequency does not continue to change for a time and then return to REFLEX OSCILLATORS 583 fa ■ ^^ e might equally well have illustrated this by an example in whichthe tuner was cooling. In order to avoid overshoot it is necessary that nothermal impedance exist between the heat source and the expanding , as an example of a tuner in which overshoot will occur, one may citean expanding strut in the form of a tube heated by a resistance heater in-ternal to the tube. In order to transfer heat from the resistance heater tothe tubing the former must of necessity operate at the higher , in the example given
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
