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34/ [[vertical annotation in left margin] Others are, Merriam, Edwin Conklin, William Mann [[/left margin]] and some other scientists to furnish a 5 minute phonograph disk for use in Higschools. Each one of us must limit his [[red underline]] talk to 5 minutes [[/red underline]] and [[strikethrough]] the [[/strikethrough]] use no technical terms which cannot be easily understood My subject is chemistry. I had prepared a written copy. The record was made in a sound proof room. [[strikethrough]] when [[/strikethrough]] with a little glass pane for the recorder to observe me. Signal was given first by buzzer then by a flash from 2 incandescent lamps. My [[red underline]] voice was recorded electrically [[/red underline]] on a thick wax disk. Afterwards my speech was reproduced with extraordinary clarity and better volume of voice than my own. However I did not recognize my own voice except for the intonation in my speech. The record was [[strikethrough]] made on [[/strikethrough]] [[end page]] [[start page]] 35/ [[strikethrough]] to [[/strikethrough]] be reproduced on brown paper discs coated with a thin layer of [[red underline]] resorcinol resinoid [[/red underline]] A material with which I experimented in my early Bakelite days and on which a patent was issued to me. I did not use the material for practical purposes because 1/ [[red underline]] resorcinol is so much more expensive than phenol. [[/red underline]] 2/ It turns even darker than Bakelite 3/ It stubbornly retains last traces of water hence a great objection for electrical purposes. 4/ Its [[red underline]] hardening proceeds while in the A state, [[/red underline]] [[strikethrough]] the pole [[/strikethrough]] a [[underline]] partial [[/underline]] polymerisation occuring [[strikethrough]] on [[/strikethrough]] while in storage. For this special purpose where the layer is very thin and can be applied as a varnish these objections do not exist [[red underline]] Prof. Beans of Columbia [[/red underline]]
Transcription Notes:
Hal T. Beans, professor of Chemistry at Columbia University from 1921-1947.