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The Wilhelmy plate to be used must be absolutely clean. A platinum plate must stripped of any organics with a solvent or heated by a flame. The Wilhelmy plate is then mounted on the electrobalance such that it is immersed perpendicular to the surface of the liquid and a uniform meniscus is achieved. Disposable paper plates can also be used.
Prior to the 1960s, a pressure switch was used in the hydraulic braking circuit to control power to the brake lights; more recent automobiles use a switch directly activated by the brake pedal. In dust control systems (bag filter), a pressure switch is mounted on the header which will raise an alarm when air pressure in the header is less than ...
When the surface of a metal plate is sufficiently polished to be used for engraving, the slightest scratch upon it will print as a black line. An engraved plate from which visiting cards are printed is a good example of some elementary principles of engraving. It contains thin lines and thick ones, as well as a considerable variety of curves.
Wheel cover A strip of thin steel plate, curved to a radius slightly greater than that of a wheel, to prevent mud and oil being spattered over the locomotive. Wheel covers are usually bolted to the engine truck frame for the truck wheels, and the under side of the running board for the driving wheels. British, splasher. Wheel cover block
Audience applause determines the winning team. Sometimes, Jimmy will have the spitter and receiver switch positions if their first spit-take is particularly good or they have extra time. The winning team receives a pair of hand towels embroidered with the "Competitive Spit-Takes" logo, while the losing team receives a pair of moist towelettes.
Oil paint contains particles of pigment applied using a drying oil, such as linseed oil. The conventions and techniques of using oils demands a knowledge of drawing and painting, so it is often used in professional practice. When hand-colouring with oils, the approach is more often to use the photographic image simply as a base for a painted image.
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