A rotating furnace is a device for making solid objects which have concave surfaces that are segments of axially symmetrical paraboloids. Usually, the objects are made of glass. The furnace makes use of the fact, which was known already to Newton, that the centrifugal-force-induced shape of the top surface of a spinning liquid is a concave paraboloid, identical to the shape of a reflecting telescope's primary focusing mirror.
They can be used in various ways, including (after being silvered) as primary mirrors in reflecting telescopes; they have also been used for solar cookers.
Read more about Rotating Furnace: Design, Mathemetical Model, Uses
Famous quotes containing the word furnace:
“‘Alas!’ quoth he, ‘but newly born in fiery heats I fry,
Yet none approach to warm their hearts or feel my fire but I.
My faultless breast the furnace is, the fuel wounding thorns;
Love is the fire, and sighs the smoke, the ashes shame and scorns;
The fuel justice layeth on, and mercy blows the coals;
The metal in this furnace wrought are men’s defiled souls;”
—Robert Southwell (1561?–1595)