. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 30 BELL SYSTEM TECHNICAL JOURNAL the principles of shielding were explained in an earlier paper/^ Fig. 13 of that paper showing the complete shielding of the balance as con- structed for the measurement of direct capacity by the Colpitts method. Over five million capacity and conductance measurements have been made with the shielded capacity and conductance bridge and in a forthcoming paper Mr. G. A. Anderegg will give details of actual construction of apparatus and of
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. 30 BELL SYSTEM TECHNICAL JOURNAL the principles of shielding were explained in an earlier paper/^ Fig. 13 of that paper showing the complete shielding of the balance as con- structed for the measurement of direct capacity by the Colpitts method. Over five million capacity and conductance measurements have been made with the shielded capacity and conductance bridge and in a forthcoming paper Mr. G. A. Anderegg will give details of actual construction of apparatus and of methods of operation as well as some actual representative results. Direct Admittance Measurements For simplicity, the preceding definitions and methods of measure- ment have been described in terms of capacity, but everything may be generalized, with minor changes only, for the definition and measure- ment of direct admittances with their capacity and conductance components. The essential apparatus change is the addition, in parallel with the variable capacity standards employed, of a variable conductance standard, which shifts direct conductance from one side of the bridge to the other, without changing the total reactance and conductance in the two sides of the bridge. This may be practically realized in a great variety of ways as regards details, which it will suffice to illustrate by Fig. 9, where C, C", C", G', G", indicate the. pig_ 9—Variable Direct Conductance and Capacity Standard for Direct Admittance Bridge continuously variable capacity and conductance standards with enough step-by-step extensions to secure any desired range. For the continuously variable conductance standard a slide wire is represented, with a slider made up of two hyperbolic arcs so pro- portioned that, as the slider is moved uniformly in a given oblique direction, conductance is added uniformly on the left and just enough of the wire is short-circuited to produce an equal condu
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
