[time-nuts] How quartz crystals are (were) fabricated

Bob Camp lists at rtty.us
Thu Aug 1 16:08:45 UTC 2013


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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] 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




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