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  1. R

    The Day The Symbol Changed

    Being an old DeVry man, circa '58/'59 , (when it was on Belmont Ave!) that Hallicrafters schematic looks strangely familiar to me. As for change, I'm still struggling with cps changing to Hertz!!
  2. R

    The Day The Symbol Changed

  3. R

    Need project ideas

    In 1957 Popular Electronics magazine (out of print) published an article for constructing a "rudimentary computer" that could play the old parlor game of "21". It utilized a five deck mechanical stepping relay to do it's "calculations" and a series of 21 lights, By pushing a 'player' button, a...
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    Need a Project. Ideas?

    In 1957 Popular Electronics magazine (out of print) published an article for constructing a "rudimentary computer" that could play the old parlor game of "21". It utilized a five deck mechanical stepping relay to do it's "calculations" and a series of 21 lights, By pushing a 'player' button...
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