Woodworker's Journal 2008-32-1, страница 9

Woodworker

COLONIAL SAW

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WJ Responds: Ralph, you are correct in noting the similarities between Ian's twin wedged mortise and tenon joinery and the wedge technique employed to hold, say, an ax head to its handle. But to infer that they are the same thing goes a bit too far. Just as my son's '91 Chevy pickup (complete with rust spots and dents) is indeed a truck, to say it is the same as a 2(K)8 Mack super diesel is not exactly accurate.

—Rob Johnstone

fading away.

(Circle No. 12 on PRODUCT INFORMATION form)

Batteries I Have Known

In the October issue /Questions & Answers], Chris Marshall answered a question on why there are no "B" batteries, and I would guess that Chris is not old enough to remember. Because 1 had my own radio and TV service shop, I remember them well.

Back in the late 1930s and early 1940s, commercial broadcast band radios became portable. They operated on small vacuum tubes and were powered by batteries. The "A" battery inside the radio was for the purpose of powering the filaments of all the tubes, which required a 1.5-volt battery, and it was known as the "A" battery. The tubes required a higher voltage on the plate element to enable the amplification to take place, and that battery was known as the "B" battery. It was usually at least 45 volts, more frequently 67.5 volts, and occasionally there were two "B" batteries in series to provide 90 volts. 'Hiis was more common in shortwave radios.

The comment Chris made that consumer goods that used these batteries went out of existence is true. In this case, it was the transistor that made that happen about the mid-1950s.

Donald Bilicki

Marietta, Georgia ^

&

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February 2008 Woodworker's Journal