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Two modern electric lamps with lampshades. A lampshade is a fixture that envelops the light bulb on a lamp to redirect the light it emits. The shade is often affixed onto a light fixture to reduce the intensity of the light to observers, shield the light from a harsh environment, or for decoration by altering the color or creating shadows.
Although their partnership lasted less than a year, D'Arcy Gaw exerted a strong and lasting influence on van Erp's design sensibility. He began making lamps to her design during this period, with shades incorporating mica panels. [6] In 1915, van Erp exhibited at the Panama–Pacific International Exposition, a World's Fair held in San Francisco.
The Fostoria Shade and Lamp Company was the largest manufacturer of glass lamps in the United States during the early 1890s. It began operations in Fostoria, Ohio , on May 17, 1890. The plant was run by Nicholas Kopp Jr., a former chemist at Hobbs, Brockunier and Company in West Virginia .
Mica sheets are used to provide structure for heating wire (such as in Kanthal or Nichrome) in heating elements and can withstand up to 900 °C (1,650 °F). Single-ended self-starting lamps are insulated with a mica disc and contained in a borosilicate glass gas discharge tube (arc tube) and a metal cap. [24]
Roscoelite is a green mineral from the mica group that contains vanadium. The chemical formula is K(V 3+, Al, Mg) 2 Al Si 3 O 10 (OH) 2. [2] Crystals of roscoelite take on the monoclinic form, and are from the 2/m point group. The appearance is semi transparent to translucent coloured olive brown to green brown. The lustre is pearly.
However, cadmium is toxic. Together with selenium and sulphur it yields shades of bright red and orange. [7] Adding titanium produces yellowish-brown glass. Titanium, rarely used on its own, is more often employed to intensify and brighten other colorizing additives. Uranium (0.1 to 2%) can be added to give glass a fluorescent yellow or green ...