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  1. Replies
    22$$
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    885

    Slight digression - mods, lend a sympathetic ear....

    Slight digression - mods, lend a sympathetic ear.
    I knew them well. Early in my career I was known as the carbon pile man. They were used in differential gearbox regulators, typically on paper...
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    22$$
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    885

    DC machines were around since the 1830s.

    DC machines were around since the 1830s.
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    22$$
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    885

    A variac wouldn't do you much good on DC.

    A variac wouldn't do you much good on DC.
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    22$$
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    885

    A DC generator with a variable speed prime mover...

    A DC generator with a variable speed prime mover possibly?
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