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  2. Spacers and standoffs - Wikipedia

    en.wikipedia.org/wiki/Spacers_and_standoffs

    In general, a spacer is a solid material used to separate two parts in an assembly. Spacers can vary in size from microns to centimeters. They can be made of metal, plastic, glass, and other materials. Shapes include flat sheet, cylindrical and spherical. Two sizes of metal standoffs and one plastic standoff.

  3. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes

  4. List of U.S. National Water Ski Championships champions

    en.wikipedia.org/wiki/List_of_U.S._National...

    Barbara Clack Dicksie Ann Hoyt Barbara Clack Dicksie Ann Hoyt 1966 Miami, Florida Tom Decker Roland Hillier Paul Merrill Paul Merrill Barbara Clack Barbara Clack Barbara Clack Barbara Clack 1967 Austin, Texas Chuck Stearns Alan Kempton Jim Jackson Chuck Stearns Stephanie Stephens Weslie Walker Barbara Clack Wesley Walker 1968 Canton, Ohio

  5. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.

  6. Thomas Clark (chemist) - Wikipedia

    en.wikipedia.org/wiki/Thomas_Clark_(chemist)

    He became known for the discovery of the phosphate of soda, and the process of lime softening of hard water the 'Clark process'. A Clark degree (°Clark) of water hardness is defined as one grain (64.8 mg) of CaCO 3 per Imperial gallon (4.55 litres) of water, equivalent to 14.254 ppm. and 10^5 parts of water

  7. Steam locomotive components - Wikipedia

    en.wikipedia.org/wiki/Steam_locomotive_components

    Water compartment Tank for water to be used by the boiler to produce steam. [3]: 79 Coal bunker Compartment for storage of fuel before being directed to the firebox. When the fuel is coal (and in the distant past, coke or wood), the fireman shovels it manually through the firebox door or, in larger locomotives, by operating a mechanical stoker.