. The Bell System technical journal . different methods of deriva-tion. The recorder indications are continuous average readings based onan area having a definite width and a length of a few corrugation spaces ;?, \ N ALPETH CORE DIA = STANDARD= \.20tJ-;xF ± \ \ 5. \ \ S\ N \ OV O N o X \\ c\ K X s ;n. A \ >e \ A V^ -5 0 5 1C 15 CAPACITANCE X Fig. 7 — Capacitance versus thickness measurements of caMe sheathingsample. 366 THE BKLL SYSTEM TECHNICAL JOUKNAL, MARCH 195-1 KU. ■■^ Y ■1===- 4- SI 1 ttei^ 1 ^*|l 2II .■: <o .i 0 ■■:::;° 1 IE [ _ % 1 ...i:

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. The Bell System technical journal . different methods of deriva-tion. The recorder indications are continuous average readings based onan area having a definite width and a length of a few corrugation spaces ;?, \ N ALPETH CORE DIA = STANDARD= \.20tJ-;xF ± \ \ 5. \ \ S\ N \ OV O N o X \\ c\ K X s ;n. A \ >e \ A V^ -5 0 5 1C 15 CAPACITANCE X Fig. 7 — Capacitance versus thickness measurements of caMe sheathingsample. 366 THE BKLL SYSTEM TECHNICAL JOUKNAL, MARCH 195-1 KU. ■■^ Y ■1===- 4- SI 1 ttei^ 1 ^*|l 2II .■: <o .i 0 ■■:::;° 1 IE [ _ % 1 ...i::::;=- -V-^ ^ ,--- ::::: = . .: : ^ 8 --4^-:^^^|^|- <z^---- 1 ^ -^J^M 5o^, , 1 I ^^4 11- < ^-!ll cc^*S . - --^_^_ . -^ ^ ^ou --:- 1 _=^^ ■ ^7^ 1 --tt^- 1 2tiJ 1 -P^M- 1 II -Q: <in f----== ce X 0 0 i l|=r ^^ 1 ^l ° i :ih:...... [ 4 ^F^ i °^ ^fe 1 ....;s^ A —. i -==;r J t ,\f ZU- K i^ ■----. 1 i^^^^ ni V v dT/Ty qoOO X 3DNVilDVdVD iN3lN3bDNI. INCREMENTAL SHP:ATH rillCKMOHS MEASUREMENTS 307

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1