| | Bell Laboratories Record - March 1930 Vol.8 No.7
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| | by Ludwell Sibley - Flemington, New Jersey
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In the days when a couple of million miles of telephone and telegraph
circuits were carried on open-wire lines in the U.S., the Bell companies had a
strong interest in improved designs for insulators. For example, a telephone
call from New York to San Francisco in 1920 went through wires supported on, at
... [more]
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| | From the Land "Down Under" - Australian Insulators
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Glass insulators were first manufactured in Australia in c. 1926 by
Australian Glass Manufacturers. Their factory was, and still is, located on
South Dowling Road in Sydney. Australian Glass Manufacturers (A.G.M.) had
developed a toughened type of glass very similar to Pyrex glass. Since the Pyrex
... [more]
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| | Letters to the Editor
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Dear Carol,
It was interesting to see the pictures of the threadless porcelain insulator
in the January, 1986 issue of "Crown Jewels" (page 31) which belonged
to Larrin Wanechek of Cle Elum, Washington.
I have been in touch with Larrin because I have two insulators similar in
... [more]
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| | "After Hours" Glass - Whitall Tatum Company
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In 1922, the prestigious glass company, Whitall Tatum, of Millville, N.J.,
began to manufacture glass insulators. The insulator plant, subsequently owned
by the Armstrong Cork Co., and later, by the Kerr Glass Manufacturing Co.,
became one of the world's most prolific producers of insulators. It is estimated
... [more]
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| | Cleaning Your Insulators
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| | by Charlie Allmon
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Slightly over four years ago, this magazine published a letter from a
collector wanting information on cleaning insulators. Mr. Letcher, are you still
an active collector? I hope so, because this article is a response to your
inquiry. I hope it will also be of interest to others.
... [more]
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| | The Porcelain Corner
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| | by Elton Gish, NIA #41
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Dear Elton,
I have a sim U-632 with the following blue underglaze ink marking. What do
all the numbers represent?
PINCO 75
223 R
5230
I also have a U-660 and another style with the following blue underglaze ink
markings:
... [more]
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