Fred Abse
Guest
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 Posted:
Sun Nov 27, 2005 5:35 pm Post subject:
Re: What are these? |
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On Tue, 22 Nov 2005 12:52:09 -0700, Warren Weber wrote:
| Quote: | Looking through my "stuff" and found these items I have had for ages. One is
a (Brown converter for continuous balance system)
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Part of a Honeywell-Brown autobalance potentiometric chart recorder. Chops
the error voltage at line frequency. This is then amplified and phase
split and used to drive a two-phase motor which drives a slidewire
potentiometer to restore balance, and the pen/pointer assembly. Used
extensively in steelworks and power stations well into the 1970s.
| Quote: | the other a (S.P.D.T.
synchronous converter switched by 19 volt AC) What and how were they used?
WW2 stuff so only you oldies may be able to help. Pictures on
alt.binaries.pictures.radio Warren
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Pics not available here, but it sounds like another synchronous chopper as
described above. Maybe Leeds & Northrup.
--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
(Stephen Leacock) |
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