(corrected text)???
One of the earliest schematics I crossed was the Howard W Sam's Photofact for a 1951 Westinghouse television.
It used the lower case letter 'u' for? mu, thus a 10 microfarad (microFarad) capacitor was marked? '10 uf'? on the
schematic. Yes it was the lower case? letter 'u' and lower case letter 'f'. Of course there were caps marked 'uuf'
for micromicrofarad, today referred to as picoFarad using the letter pair 'pF'.
It was not until encountering an IBM Selectric typewriter, that the secretaries typing the manuals began using the
actual ¦Ì symbol. Before that time, they used the lower case letter 'u' as that was the closest thing on the manual
Underwood typewriters of the period.
