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I just took a look at a few hobbyist magazines and some product schematics from several different decades, and your speculation looks pretty solid. Based on that random, statistically insignifcant sample, the UK has been quite consistent over time and across publications aimed at quite different readers. The US, not so much, even within a single company. The earliest schematic for HP's first product, the 200A, surprised me with its use of the mu symbol. A schematic for the same product, but of later manufacture, uses "m" for micro. a seemingly backwards step. Textbooks and refereed journals paid the extra ha'penny for a mu, but hobby magazines were a different story.
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I did not check any German or French pubs to see what conventions were followed there. -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way Stanford University Stanford, CA 94305-4070 On 9/1/2022 01:56, G8HUL wrote:
Very likely a UK/US thing. pF (puff) has always been in common usage here from the very early days so mmF would not have been common; nano, however, took some time to gain traction, probably as late as the 1970s. We would have asked for a thousand puff capacitor rather than 1n. It seemed to have been pushed by the capacitor manufacturers and their markings, probably to save space. |
