What are these?

Looking through my "stuff" and found these items I have had for ages. One is a (Brown converter for continuous balance system) 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

Reply to
Warren Weber
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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.

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
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Reply to
Fred Abse

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