mains operated equipment
61Tube socket — Left to right: octal (top and bottom view), loctal, and miniature (top and side view) sockets. An early transistor socket and an IC socket are included for comparison. Tube sockets are electrical sockets into which vacuum tubes (also known as… …
62Relay — This article is about the electrical component. For other uses, see Relay (disambiguation). Automotive style miniature relay, dust cover is taken off A relay is an electrically operated switch. Many relays use an electromagnet to operate a… …
63Inverter (electrical) — An inverter is an electrical device that converts direct current (DC) to alternating current (AC)[1]; the converted AC can be at any required voltage and frequency with the use of appropriate transformers, switching, and control circuits. Solid… …
64Columbia Fire Department — Established 1893 Staffed Career Staff 140 ISO rating 2 Stations 9 …
65Mechanical fan — Household electric box fan with a propeller style blade A mechanical fan is a machine used to create flow within a fluid, typically a gas such as air. A fan consists of a rotating arrangement of vanes or blades which act on the air. Usually, it… …
66Parachuting — Parachuting, also known as skydiving, is where a person jumps from enough height so that he can deploy a fabric parachute and land safely.The history of parachuting appears to start with Andre Jacques Garnerin who made successful parachute jumps… …
67Crystal radio — Crystal set redirects here. For the Australian rock band, see The Crystal Set. A modern reproduction of an antique crystal set. It is tuned to different stations by moving the sliding contact (right) up and down the tuning coil (red). The device… …
68Shorepower — (also known as cold ironing, shore power or shore supply, especially in the UK) is a power source from land used to power marine vessels when in a harbor. The term can also be applied to aircraft or land based vehicles (such as campers, heavy… …
69Roxburgh Branch — Infobox rail line name= Roxburgh Branch type= Branch line system= New Zealand railway network status= Closed locale= Otago, South Island start= Milton end= Roxburgh stations= 18 open= 1877 (to Lawrence) 1914 (to Beaumont) 1925 (to Miller s Flat)… …
70Environmental issues in New York City — are affected by the city s size, density, abundant public transportation infrastructure, and location at the mouth of the Hudson River. New York City also plays an important role in national environmental policy because of its size and influence …
