APPLICATIONS of the sealed-off cathode-ray XX tube to the field of radio have been previously well treated, so the author gains by concentrating on other applications, which are shown to be wide and ...

BECAUSE of demand the present text has been off the market for some time, so the author has taken the opportunity of bringing some of the matter up to date and also of incorporating applications of ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

General Electric mercury condensation pump D195B73. Label reads: "Mercury Condensation / Pump / Volts 110 Casing type D195 B73 / Total Watts 365 Pump [Type] D101 B73 / Heating Element [type] B158 B159 ...