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Hallmark
The mark or marks designating that a piece of work has received an official approval of quality. Historically, hallmarks referred an object back to a specific guild hall, but now can mean any mark that attributes an object to its maker.
Hammered Glass
Glass seen most commonly on outdoor fixtures that has a rippled, pitted, peened, or antique aspect.
Hang-straight
A ball-and-socket joint coupling between a canopy and a stem that allows a bit of play between a pitched or uneven ceiling and a lighting fixture so that the fixture will “hang straight”.
Harp
A metal U-shaped bracket that spans a light-bulb and is used to attach a shade onto a lamp.
Hepplewhite
George Heppelwhite (1727-1786) was an English designer in the 18th century who frequently collaborated with the Adam Brothers. He wrote "The Cabinet Maker and Upholsterer's Guide."
Hermes
A column in the form of a male figure and derived from Greek architecture. See also "Caryatid" and "Telamon".
Hickey
A threaded pipe coupling with a side opening used in wiring a light fixture and for attaching a fixture to an junction box.
Holophane
A type of glass made by the Holophane company (1898 – present) characterized by clear, non-tint color and a sharply ribbed surface. The ribbing and shape of the glass are directly related to the diffusion pattern and intensity of light produced by the fixture.
Hot Blast
A live flame lantern design whereby some of the hot 'exhaust' air was recirculated down the side tubes and mixed with fresh air and fed to the burner. This was an improvement over the non-circulating, “dead-flame” configuration.
Hurricane Lamp
A lamp having a glass housing to protect its candle from the wind and originating in 19th-century oil and candlestick lamps for marine use.