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  2. 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

  3. 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.

  4. Washer (hardware) - Wikipedia

    en.wikipedia.org/wiki/Washer_(hardware)

    Part of a self-aligning nut; it is a washer with one radiused surface, which is designed to be used in conjunction with a mating nut in order to allow for up to several degrees of misalignment between parts. [4] Anchor plate or wall washer A large plate or washer connected to a tie rod or bolt.

  5. Lime softening - Wikipedia

    en.wikipedia.org/wiki/Lime_softening

    Lime softening (also known as lime buttering, lime-soda treatment, or Clark's process) [1] is a type of water treatment used for water softening, which uses the addition of limewater (calcium hydroxide) to remove hardness (deposits of calcium and magnesium salts) by precipitation.

  6. 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.

  7. 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