. The Bell System technical journal . l plots for a number of trial configurations. Thenby making point by point calculations of the electron paths the best con-figuration was chosen. A typical example of such path tracing is shown inFig. 65. This figure shows the equipotential lines and the trajectoriescomputed for electrons on the inner and outer boundaries of the outgoingstream. The method of calculating the trajectories has been described byZworykin and Rajchman.^ It assumes that space charge may be neg-lected. Fig. 65 shows that the repeller design is such that the cylindricaloutgoing str
. The Bell System technical journal . l plots for a number of trial configurations. Thenby making point by point calculations of the electron paths the best con-figuration was chosen. A typical example of such path tracing is shown inFig. 65. This figure shows the equipotential lines and the trajectoriescomputed for electrons on the inner and outer boundaries of the outgoingstream. The method of calculating the trajectories has been described byZworykin and Rajchman.^ It assumes that space charge may be neg-lected. Fig. 65 shows that the repeller design is such that the cylindricaloutgoing stream is focussed upon its return onto the frame supporting thefirst grid. The cathode spike prevents emission from the central portionof the cathode, since it would be difficult to prevent electrons from thisportion from returning into the cathode space. A second requirement on 12 V. K. Zworykin and J. A. Rajchman, Proc. of , Sept. 1939, Vol. 17, No. 9, TUNER BOW- FLEXIBLEDIAPHRAGM TUNER SCREW RESONATOR COUPLING LOOP. -REPELLER GRIDS CATHODE SPIKE CATHODE _CATHODEi HEATER BEAM-FORMINGELECTRODE _ TUNERBACK STRUT Fig. 64.—Section view of the 2K29 reflex oscillator shows the electron opticalsystem used in eliminating hysteresis. (Fig. 65) This tube has an internal cavity and isdesigned for the frequency range from 3400 to 3960 mc/s. 565 566 nELL SYSTEM TECHNICAL JOURNAL the design was that the spread in the transit angle for zero signal should besmall. This requirement is not as stringent as might be expected. Thecontribution to the electronic conductance by a current element whose APPROXIMATE ZERO EQUIPOTENTIAL
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