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This is a list of the National Register of Historic Places entries in Columbus, Ohio, United States.The National Register is a federal register for buildings, structures, and sites of historic significance.
Boiling chips. A boiling chip, boiling stone, or porous bit anti-bumping granule is a tiny, unevenly shaped piece of substance added to liquids to make them boil more calmly. Boiling chips are frequently employed in distillation and heating. When a liquid becomes superheated, a speck of dust or a stirring rod can cause violent flash boiling.
A widespread legend among the tribes is that the stone gets its color from the flesh and blood of their ancestors." Bass Island Brownstone Company Quarry, in Lake Superior, near La Pointe, WI, NRHP-listed. Source of brownstone for buildings in Chicago, IL and Milwaukee, WI; Walczak-Wontor Quarry Pit Workshop, near Cataract, Wisconsin, NRHP ...
Indigenous peoples’ use of stone boiling involved heating stones in or near a hearth or fire before the rocks were transferred to a nearby water-filled container by using forked sticks. [2]: p. 296 [3]: p. 93 The rocks would then be removed from the container by using those forked sticks and bracing the stones to the side of the container.
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Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene, and has numerous applications because it is chemically inert. [3] The commonly known brand name of PTFE-based composition is Teflon by Chemours, [4] a spin-off from DuPont, which originally invented the compound in 1938. [4]
Polytetrafluoroethylene (PTFE), better known by its trade name Teflon, has many desirable properties which make it an attractive material for numerous industries. It has good chemical resistance, a low dielectric constant, low dielectric loss, and a low coefficient of friction, making it ideal for reactor linings, circuit boards, and kitchen utensils, to name a few applications.