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A staircase timer is an electrical switch used to control lighting on a staircase, corridor or lobby. A single action turns on the lights and they remain on for long enough to ascend or descend the stairs.
The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically. A countdown time switch switches power, usually off, after a preset time. A cyclical timer switches equipment both on and off at preset times over a period, then repeats the cycle; the period is usually 24 hours or 7 days.
Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]
The major advantage of a lighting control system over stand-alone lighting controls or conventional manual switching is the ability to control individual lights or groups of lights from a single user interface device. This ability to control multiple light sources from a user device allows complex lighting scenes to be created.
Granville Tailer Woods (April 23, 1856 – January 30, 1910) was an American inventor who held more than 50 patents in the United States. [1] He was the first African American mechanical and electrical engineer after the Civil War. [2]
NOMA was a company best known for making Christmas lights.It was once the largest manufacturer of holiday lighting in the world. [citation needed] As of 2021, the rights to the brand in Canada and the United States are owned by Canadian Tire, which sells NOMA-branded products through its namesake stores in Canada, and through an e-commerce website in the United States.
Lampchanger in the Maughold Head Lighthouse, Isle of Man.This is a model NALC-89, produced by Nav-Aids Systems, LTD, in Kent, England. An automatic lamp changer (or lampchanger) is a device used to ensure that a navigational light such as a marine lighthouse or aero beacon stays lit even if a bulb burns out.
This is a list of Advanced Dungeons & Dragons 2nd-edition monsters, an important element of that role-playing game. [1] [2] [3] This list only includes monsters from official Advanced Dungeons & Dragons 2nd Edition supplements published by TSR, Inc. or Wizards of the Coast, not licensed or unlicensed third-party products such as video games or unlicensed Advanced Dungeons & Dragons 2nd Edition ...