The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 607
Mercury-Arc Rectifier 578 APPENDIX The efficiency of the apparatus ranges from about 76 % atone quarter of full load and upwards. For further particulars the reader is referred to an articleby Mr J. E. Milnes in The National Telephone Journal for March1908. New Pattern Instrument Plug and… … Fig. 521.—New Form of Instrument Jack and Plug (Scale f) nection with switch-boards for connecting the operators in-struments, in place of the patterns shown in Figs. 97 and 98,as being neater and more compact. The connections to thedifferent sections of the sleeve of the plug are made…
Telephone
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
