On Fri, 9 Jan 2009 15:58:28 -0000, "N_Cook" put
finger to keyboard and composed:
Firstly are they synomynous?
I have a data book , printed in 1933
Westinghouse "the all-metal way" metal rectifiers ,
how to build High Tension battery eliminators
and battery chargers.
A 300V , 60mA Westinghouse one in 1933 was about 3x3x5 inches,
no mention of Selenium, trade secret then ?.
FWIW, here are some patents of around that time:
SOLID RECTIFYING ELEMENT
US Pat. 2030443 - Filed Jul 19, 1934
In order to assure a perfect operation of a selenium rectifier ...
RAILWAY TKACK CIRCUIT APPARATUS
US Pat. 2015577 - Filed Nov 9, 1934 - The Union Switch a Signal
Company
As is well known, the copper oxide rectifier (as 05 well as certain
other rectifiers of this type, such as the selenium rectifier) ...
ELECTRICAL DEVICE
US Pat. 2124306 - Filed Jul 17, 1935 - International Standard Electric
Corporation
A method of manufacturing a selenium rectifier having upper and lower
metallic members which comprises applying selenium to the- lower
member, ...
METHOD OF PRODUCING SELENIUM
US Pat. 2121603 - Filed Apr 14, 1937 -
The above described treatment of selenium rectifier plates with
reducing materials may be applied if necessary to plates of the type
in which the selenium ...
The pic
http://home.graffiti.net/diverse:graffiti.net/Se_R.jpg
Shows on the right a disassemled one from a 1959 Dansette, one of
the two , 8 layer blocks is shown, removed, on end near the ruler (0.1 inch)
Single element rectifier
Siemens lazy S logo
Made in Germany
E 250c50
Kc 0.6e 11/16
1979 Siemens databook and E250C50 were still listed,
rating 200V, 20mA
The book page is from 1967 catalogue.
Here is a 1931 Siemens patent:
APPARATUS FOB CONTROLLING ELEC
US Pat. 1929216 - Filed Apr 1, 1931 - Siemens a Habke
.... there occurs a change in the resistance of the individual valves,
which may be dry rectifier valves, such as copper oxide or selenium
valves, ...
Would the English military have had access to these size
and sort of ratings, of the later rectifiers, in 1940s,
they could have been heatsinked
- Franc Zabkar
--
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