Woodworker's Journal 2008-32-1, страница 9
COLONIAL SAW MAr IIISUO ulAMVmVKI Visit csaw.com/lamello for application ideas and suggestions. 1-800-A-LAMELLQ • lamelloacsaw.com Connect and Clamp with One Strike Fixo* Self Clamping Biscuits Plunge Fast, Easy, and Economical: • Cut groove in both workpieces simultaneously • No clamps, no waiting • Use with any biscuit joiner - no tool investment • Available in vertical and horizontal sizes 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 ^ & • CLEAR OVERGROWN LAND FAST — 2 acres/hr with 44" wide cut! MOW WEEDS, BRUSH, even 2" thick saplings — with up to 17 HP of V-Twin power! NEW TOW-BEHIND DR® FIELD and BRUSH MOWER! — ATTACHES TO YOUR ATV OR RIDING MOWER TO MOW FIELDS WHILE YOU RIDE! OUTRIGGER" TOW BAR cuts 100% outside the path of towing vehicle to mow along fences, under trees. REMOTE CONTROLS let you manage all blade, clutch, and engine functions from your towing vehicle! Self-Propelled DR* Brush Mower models also available! Vi Call NOW for a FREE DVD and Catalog! 1-877-201-5798 TOLL F£EE H YES! Please send me a FREE DVD and Catalog with complete details including low, factory-direct prices, model specifications, and How I can try one for 6 months risk-free Name_ DR' POWER EQUIPMENT. Dept. 60186X 127 Meigs Road, Vergennes, VT 05491 16 February 2008 Woodworker's Journal |
