Technical Publications by Bell System Authors Other Than in the BellSystem Technical Journal

* A reprint of this article may be obtained on request to the editor of the B.S.T.J. B.T.L. 205 206 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1 9 5 1 Ultra-High Vacuum Ionization Manometer. J . J . LANDER. 1 Rev. Sci. Instruments, v. 21, pp. 672-673, July 1950. ABSTRACT--This note describes an ionization menometer which indicates pressures more than two decades below the lower limit usually encountered at about 1 X 10 -8 mm of Hg with other manometers. This limit depends on the design of the gauge; however, values reported for various gauges do not differ much from that given above. Commonly the limit is observed as a lowest reading obtained despite recourse to more or less drastic methods of producing lower pressures, or a variety of changes in gauge design. The flash filament method of pressure measurement has been used to measure lower pressures and at the same time to indicate the lower limit of an ionization guage. Metallized Paper for Capacitors* D . A. M C L E A N . 1 I.R.E., Proc., v. 38, pp. 1010-1014, Sept., 1950. ABSTRACT--Metallized capacitor paper is attracting widespread interest as a way of reducing capacitor size. In metallized paper capacitors, the usual metal foil is replaced by a thin layer of metal evaporated onto the surface of the paper. Lacquering the paper prior to metallizing increases the dielectric strength and insulation resistance, reduces atmospheric corrosion of the metal, and diminishes the rate of loss of electrode metal by electrolysis. Owing to the extreme thinness of the metal layer, metallized paper capacitors are subject to a type of failure not ordinarily found in conventional capacitors.