BSTJ 8: 2. April 1929: Purified Textile Insulation for Telephone Central Office Wiring. (Glenn, H.H.; Wood, E.B.) (1929)
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249 PURIFIED TEXTILE INSULATION with humidity and with the degree of purity of the textiles. The problem was finally solved by the development of the test equipment shown in Figs. 6, 7 and 8. … 5 6 7 TIME IN DAYS Fig. 4—A.C. conductance of 50 ft. of twisted pair wire insulated with double servings of equal thickness. Figs. 6 and 7 show a heat-insulated glass tank of about one cubic foot capacity fitted with an insulating cover in which holes normally closed with stoppers are used to…
