. The Bell System technical journal . ng to potential distributions of theC and D type, for which Zy = 7, appear as a celluloid plane inclined at45 degrees, on which the values of the potential minima are of the C overlap type have been omitted. Solutions of the Btype are represented by the concave surface of the model. Viewing themodel from a different angle as shown in Fig. 13 (where the celluloidsheet is removed) the unstable B region appears as an over-hangingcliff extending between 7 values of and 4. Bounding curve c SPACE CHARGE BETWEEN PARALLEL PLANE ELECTRODES 6
. The Bell System technical journal . ng to potential distributions of theC and D type, for which Zy = 7, appear as a celluloid plane inclined at45 degrees, on which the values of the potential minima are of the C overlap type have been omitted. Solutions of the Btype are represented by the concave surface of the model. Viewing themodel from a different angle as shown in Fig. 13 (where the celluloidsheet is removed) the unstable B region appears as an over-hangingcliff extending between 7 values of and 4. Bounding curve c SPACE CHARGE BETWEEN PARALLEL PLANE ELECTRODES 69 separating the unstable region from the stable region is drawn on themodel and lies along the vertical surface of the cliff. The smallregion lying between 7 values of 0 and , for which direct transitionsbetween A solutions and D solutions occur, can be seen in both viewsas a small vertical cliff. Solutions corresponding to varying conditions will be given by theposition of a movable particle confined to the surface of the Fig. 12—-A three-dimensional model illustrating the current-voltage of types C and D appear on the celluloid surface and solutions of the Btype appear on the concave surface. When this particle lies on the celluloid surface it may be moved aroundat will and will not fall off unless an attempt is made to go tolarger values of the injected current 7 than is permitted by the bound-curve a (the curved edge of the celluloid). The particle may, however,fall off at this edge and land on the concave surface from which itcan escape only by climbing up the surface to the bounding curve bwhich is common to both surfaces. The overhanging cliff is, however,particularly treacherous, for unless the particle is supported by the 70 BELL SYSTEM TECHNICAL JOURNAL existence of sufficient resistance in the circuit connected to the secondelectrode, it will go through the model coming to rest on the celluloidsurface above. With no resistance in
Size: 1677px × 1490px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
