interrupted signalling current
21Indianapolis 500 — Indycar race infobox Name=Indianapolis 500 Track Venue=Indianapolis Motor Speedway Sponsor= [http://www.indy500.com/sponsors/ Various] First race=1911 First IRL race=1996 Distance=500 miles (804 km) Laps=200 Previous names=International 500 Mile… …
22Timeline of meteorology — The timeline of meteorology contains events of scientific and technological advancements in the area of atmospheric sciences. The most notable advancements in observational meteorology, weather forecasting, climatology, atmospheric chemistry, and …
23David Kellogg Lewis — Infobox Philosopher region = Western Philosophy era = 20th century philosophy color = #B0C4DE name = David Kellogg Lewis birth = September 28, 1941 flagicon|USA|size=20px Oberlin, Ohio death = October 14, 2001 flagicon|USA|size=20px Princeton,… …
24Wigwag (railroad) — This article is about the wigwag railroad crossing signal. For other uses, see Wigwag (disambiguation). A Magnetic Flagman wigwag signal in use in southern Oregon in 2007. Wigwag is the nickname given to a type of railroad grade crossing signal… …
25Royal Institution Christmas Lectures — Michael Faraday delivering a Christmas Lecture in 1856. The Royal Institution Christmas Lectures are a series of lectures on a single topic, which have been held at the Royal Institution in London each year since 1825. The lectures present… …
26History of the telephone — The history of the telephone chronicles the development of electrical technology that enabled bidirectional human speech conversations over distances farther than a person could shout.Telephone prehistoryMechanical devicesBefore the invention of… …
27David Lewis (philosopher) — For other people named David Lewis, see David Lewis (disambiguation). David Kellogg Lewis Full name David Kellogg Lewis Born September 28, 1941 Oberlin, Ohio Died October 14 …
28Manchester–Sheffield–Wath electric railway — [v · d · …
29George Forbes (scientist) — George Forbes was an electrical engineer, astronomer, explorer, author and inventor, some of whose inventions are still in use. BiographyBorn in Edinburgh in 1849, Forbes was the second son of James David Forbes and Alicia Wauchope. His father… …
30Opening of the Liverpool and Manchester Railway — The Duke of Wellington s train and other locomotives being readied for departure from Liverpool, 15 September 1830 The opening of the Liverpool and Manchester Railway (L M) took place on 15 September 1830 …
