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Question - Why was mmf used instead of pf.
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Since I am older than Palmer, I will answer.
pico had not been invented yet.
Thought Alex might be amused by this:
Capacitance:..."The farad is too large a unit for
radio or electrical work; hence the microfarad...
and the micromicrofarad...are commonly used."
Picofarad: "Obsolete term for micromicrofarad."
Electronics Dictionary, Cooke & Markus, McGraw-Hill, 1945