[GreenKeys] RE: What is a polar relay for?

[amourdutigre]

I just ordered this book from an Amazon book dealer, cost less than the shipping for standard delivery at $3.99.

Joe KB0TXC

An excellent reference for all this stuff is a book "Principles of
Electricity applied to Telephone and Telegraph Work" put out by AT&T
in several editions between 1933 and the 1960s.  I see this book is 
available online at 
www.pmillett.com/Books/intro_att_principles.pdf

(I found that with google, which turns up a lot of other references
to the book.)



jhhaynes at earthlink dot net
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