On 31/07/13 23:59, Alberto di Bene wrote:
A really fascinating story in pictures of the preparation and
manufacture of quartz crystals for radio communication.
Dating back to 1943... how times have changed...
Copied from another list.
http://archive.org/details/6101_Crystals_Go_to_War_01_20_16_21
Nice video. Would be interesting to know what etching and neutralizing
agents where used, as well as the cooling and grinding agents. Also nice
to see the relatively low-tech they used with pencil markings.
Nice combination of techniques to get orientation and faults located.
The cut-angle for the GT-cut seemed to be well established in the
mechanics of the cutting tables.
Would be interesting to see a similar movie from a modern facility.
Cheers,
Magnus
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