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

[david_jackson at agilent.com]

All:

I've sent a copy of the files to Alister and John at Trackpads and they will try to get it posted there.

Also, take a look at US patent 2,389,564.  It covers the turns counting mechanism as originally designed and uses optical film as the recording media.  The actual cal system controls the adding machines directly that do the interpolation and print the booklets.

Thanks,

Dave WA4OBJ

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Message: 9
Date: Wed, 5 Jul 2006 11:46:51 -0600
From: <david_jackson at agilent.com>
Subject: [Milsurplus] TS-186 & BC-221& LM: How'd they calibrate
To: <milsurplus at mailman.qth.net>
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George:

Jeremy Harmer generously made several .pdf files of the article that appears in Electronics Magazine in May of 1944 that went into some detail about the calibration process.  

There was a motor driven turns counter that was coupled into an NCR totalizer (calculator) that automatically determined when zero beat was accomplished and printed the results.  As I recall, it dropped the calibration time down from 12 or so hours to about 1 1/2 hours, most of which was typing the book.  If you re interested, I will email you the several .pdf files of the off the list because of the size of the files.  

Thanks,

Dave Jackson WA4OBJ

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