"The crystal units of the day were either X- or Y-cut plates mounted loosely between two metal plates which served as electrodes."
That explains the schematic symbol for crystals! I had wondered how they got that "box-in-a-capacitor" shape!
Spent a lot of my early ham years grinding crystals. Used a plate of glass and some MacCleans toothpaste! Imagine what that musta done to your teeth if you could grind quartz with it!The thought of tweaking slabs of quartz to resonate right on freq - especially given the state of test equipment available then - is mind-boggling. Nobody got to just toss an off-frequency crystal.
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