discharge switch
41Spark-gap transmitter — A spark gap transmitter is a device for generating radio frequency electromagnetic waves. These devices served as the transmitters for most wireless telegraphy systems for the first three decades of radio (1887 ndash;1916) and the first… …
42Hydrargyrum medium-arc iodide lamp — Hydrargyrum medium arc iodide, or HMI, is a mercury halide gas discharge medium arc length lamp with a multi line spectra emission. The name implies that hydrargyrum, an archaic term for Mercury (Hg), is held as a vapour mixed with other rare… …
43Large Plasma Device — The Large Plasma Device is an experimental physics device at UCLA. It is designed as a general purpose laboratory for experimental plasma physics research. The current version of the device began operation in 2001. The modern LaPD is operated as… …
44Lamp (electrical component) — A lamp is a replaceable component such as an incandescent light bulb, which is designed to produce light from electricity. These components usually have a base of ceramic, metal, glass or plastic, which makes an electrical connection in the… …
45Battery (electricity) — For other uses, see Battery (disambiguation). Various cells and batteries (top left to bottom right): two AA, one D, one handheld ham radio battery, two 9 volt (PP3), two AAA, one C, one …
46Nickel–metal hydride battery — NiMH redirects here. For other uses, see NIMH (disambiguation). Nickel–metal hydride battery Modern, high capacity NiMH rechargeable cells specific energy 60–120 W·h/kg[1] …
47Nickel-metal hydride battery — Batteries caption=Modern, high capacity NiMH rechargeable batteries EtoW=30–80 Wh/kg EtoS=140–300 Wh/L PtoW=250–1000 W/kg CtoDE=66% [http://www.powerstream.com/NiMH.htm] EtoCP=2.75 Wh/US$ [ [http://www.powerstream.com/NiMH.htm NiMH Battery… …
48Nixie tube — The ten digits of a GN 4 Nixie tube. A nixie tube is an electronic device for displaying numerals or other information. The glass tube contains a wire mesh anode and multiple cathodes. In most tubes, the cathodes are shaped like numerals.… …
49111th United States Congress — United States Capitol (2007) Duration: January 3, 2009 – January 3, 2011 Senate President: Dick Cheney (R) …
50photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
