This Article From Issue
January-February 2020
Volume 108, Number 1
Page 3
DOI: 10.1511/2020.108.1.3
To the Editors:
One might have to be a bit long in the tooth to remember selenium rectifiers [invented in 1933 and used to power electronic equipment before the adoption of silicon diode rectifiers in the 1960s], but I was a bit jarred that the graphics of them on the November–December 2019 cover appeared on the sulphur block, rather than the selenium one. My recollection of them is that they were not very efficient, were not very durable, and when overheated gave off ghastly fumes.
Richard Bair
Glencoe, IL
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