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...circuit voltages of 50–100 V. Power sources range from 30 to 500 Amps a.c. or d.c. Coated electrodes contain slag-forming ingredients (that produce a fluid coating over the weld as it cools) and gas-forming ingredients (that generate atmospheres of CO2, CO or H2 around the arc). Principal materials used in electrode coatings include: Carbonaceous material of the...

...Le Blanc, France. A Lesson in Flying: Gliding Performance Ann Welch explains how to actually fly a glider. The Rhonsperber and Primary gliders are compared, with relation to glide ratio. Clouds and Thermals Ann Welch explains what a thermal is and why they are important in gliding. Performance Penalty: Speed A test flight demonstrates the performance penalty associated...