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

[david_jackson at agilent.com]

George:

The last paragraphs of the article under "Use of Calibration Tape" state that the tapes were marked on a ruled table and then manually used to set up the interpolation machines and simultaneously print the booklets.  It is on the second to the last page just above the "Sonde Balloon"  picture.

Thanks,

Dave WA4OBJ


-----Original Message-----
From: gl4d21a at juno.com [mailto:gl4d21a at juno.com] 
Sent: Thursday, July 06, 2006 3:00 PM
To: david_jackson at agilent.com
Cc: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] TS-186 & BC-221& LM: How'd they calibrate

That's a very informative article.  I noticed Philco used Loktal 
tubes in the signal processing circuitry, probably since they were 
not rationed as octals and miniatures were.  The math is impressive, 
but that development allowed measurement on the fly.  Wonder how 
often they had to replace those variable capacitors and rotary 
switches?  That motor sriven switch hardware looks like something out 
of the NCR or Bletchley Park codebreakers.

But, it left a question.  The photos show the output being printed on 
what looks like a narrow paper tape.  Apparently this article was 
completed before the page printer was added, or did I miss 
something?  It says pages were printed, but that Frieden carriage 
looks awfully narrow.

73,
George
W5VPQ


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