Hi Remember, this was 1943. You can pick up a number of things in most scenes in the movie that would get an OSHA inspector very worried today (and rightly so).
Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Charles P. Steinmetz Sent: Thursday, August 01, 2013 11:54 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] How quartz crystals are (were) fabricated Alan wrote: >all crystals would have been subject to X-rays to some extent >because this was how the planes were located and the cutting angles >determined. The dose rate was probably quite low in this case Right. The film that Alberto posted a link to also showed (beginning at 35:30) a procedure that Reeves Sound Labs devised to lower the frequency of a crystal after final testing, using "a powerful beam of X-rays" that "alter[s] certain properties of the quartz itself." The jig looks to have quite a bit of lead shielding, although I thought they could have sealed the gap around the sliding drawer somewhat better (it does appear to be a redundant seal). Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
