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M1BYT > INFO 05.07.02 20:57l 41 Lines 1806 Bytes #999 (0) @ WW
BID : 770471M1BYT
Read: DB0FHN GUEST
Subj: Re: carbon arc
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DB0AAB<DB0PV<DB0MRW<OK0PPL<RZ6HXA<SP7MGD<GB7YKS<GB7ESX<GB7FCR
Sent: 020702/0844Z @:GB7FCR.#16.GBR.EU #:65388 [Blackpool] FBB-7.03a $:770471M1
From: M1BYT@GB7FCR.#16.GBR.EU
To : INFO@WW
G3XSE Opined with considerable skill:-
> When I was doing my HNC 30 years ago we were shown a carbon pile motor speed
> control. Although thyristors were coming in, this was a device, consisting of
> maybe 20 two inch square plates in series and a device which altered the
> pressure on them, thereby changing the resistance. This was hooked up to
> mains 240v and a motor. The lecturer then called a fag break and left the
> room. A fellow student, who had seen this before, cut a one and nine tenths
> bit of paper and inserted it between two plates.
Hi Hugh,
I wonder if you have ever come across a similar principle of speed
control, but using a salt water bath as the resistance element?
I once saw this in regular use at a power station in the Midlands. The
bath was some 15' tall, 8' wide and around 20' long. The electrodes on a
frame, were raised and lowered by large chain driven rack. I seem to
remember this controlled the speed of a 3.3kv motor.
ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
º 73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU.GBR º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
º International Museums Weekend 15+16th June 2002 º
º www.ukradioamateur.org/imw/index.html º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
º RAE CD ROM course Project and the Newcomers Intro º
º to amateur radio:- http://www.ukradioamateur.org/ º
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º QTH: Garforth, W. Yorks.. º Timed 09:40 º
º harry_m1byt@ntlworld.com º 02 Jul 2002 º
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