[Milsurplus] TS-186 & BC-221& LM: How'd they calibrate 'em?

[jmfranke]

Yes, see:
http://www.jproc.ca/ve3fab/bc221.html
for a description of an automated process that used 126 vacuum tubes.

John WA4WDL

----- Original Message ----- 
From: <gl4d21a at juno.com>
To: <Milsurplus at mailman.qth.net>
Sent: Tuesday, July 04, 2006 10:54 PM
Subject: Re: [Milsurplus] TS-186 & BC-221& LM: How'd they calibrate 'em?


Is there a description of the machinery used to measure the frequency 
and print the calibration books for these?  Was it a strictly labor 
intensive manual method, or how much 1940s automation was there?  I 
presume the intermediate numbers were scaled by some mechanical 
divider (Monroe or Marchant, anyone?), but the measurement and 
printing must have been something to behold.  I don't think I have 
ever seen this subject discussed anywhere.

Duck soup now of course with PCs, even if the initial measurement run 
has to be manually done.  Getting two typefaces and two different 
variable density print shades so they look authentic might be a 
challenge, tho.

73,
George
W5VPQ 


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