Crystals Go to War (1943)

Discussion in 'Homebrew and Kit Projects' started by WB0RIO, May 8, 2015.

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  1. WB0RIO

    WB0RIO Ham Member QRZ Page

  2. W4HAY

    W4HAY Ham Member QRZ Page

    This book goes into great detail of the WW2 efforts to obtain and process crystals.

  3. AB8RO

    AB8RO Ham Member QRZ Page

    That wore me out just watching it, I couldn't imagine doing that all day. I can never manage to get more than a dozen or so crystals sorted at a go, and I don't have to deal with all that mess.

    No wonder they used to be so damned expensive.
  4. KL7AJ

    KL7AJ Ham Member QRZ Page

    I hope they paid those ladies a LOT. Brutal combination of tedious AND super highly skilled labor. I don't think you could find an army of techs like that these days.
  5. KL7AJ

    KL7AJ Ham Member QRZ Page

    The "frequency etch" by the way, is hydrofluoric acid. Notice the lady's bare hands dunking those crystals in that.
  6. W0AAT

    W0AAT XML Subscriber QRZ Page

    Fascinating. I had a friend who would cut his own crystal blanks and grind them to frequency(he was a jeweler and had the saws etc). I had several of his crystals for my HW-16 back in the 70's.
  7. KL7AJ

    KL7AJ Ham Member QRZ Page

    By the way...THANKS....that was a fabulous flick. This sort of thing should be required viewing for every engineering student.

    And every politician, for that matter. Most folks have no clue what it takes to actually DO anything these days.
  8. W9JEF

    W9JEF Ham Member QRZ Page

    Fighting a war with rocks?

    How primitive. :rolleyes:
  9. KC9UDX

    KC9UDX Platinum Subscriber Life Member Platinum Subscriber QRZ Page

    Sure beats painting watch dials.
    KV4PD likes this.
  10. N2EY

    N2EY Premium Subscriber QRZ Page

    They did. It may not seem like a lot in today's dollars but it was a lot more than they had been making in peacetime.


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