signalling apparatus
101William Thomson, 1st Baron Kelvin — Infobox Scientist box width = 300px name = Lord Kelvin image width = 300px caption = William Thomson, 1st Baron Kelvin (1824 1907) birth date = birth date|1824|6|26|df=y birth place = Belfast, Co. Antrim, Northern Ireland death date = death date… …
102Exocytosis — For the meaning of exocytosis in dermatopathology, see exocytosis (dermatopathology). Neuron A (transmitting) to neuron B (receiving) 1. Mitochondrion 2. Synaptic vesicle with neurotransmitters 3. Autoreceptor 4. Synapse with neurotransmitter… …
103Mirror galvanometer — A mirror galvanometer A mirror galvanometer is a mechanical meter that senses electric current, except that instead of moving a needle, it moves a mirror. The mirror reflects a beam of light, which projects onto a meter, and acts as a long,… …
104Antenna (radio) — Whip antenna on car …
105Elisha Gray — Infobox Person name=Elisha Gray caption=Elisha Gray quotation= birth date=birth date|1835|8|2|mf=y birth place=Barnesville, Ohio dead=dead death date=death date and age|1901|1|21|1835|8|2|mf=y death place=Newtonville, MassachusettsElisha Gray… …
106Nathan Stubblefield — Nathan B. Stubblefield (November 22, 1860 March 28, 1928) was an American inventor and Kentucky melon farmer. It has been claimed that Stubblefield invented the radio before either Nikola Tesla or Guglielmo Marconi, but his devices seem to have… …
107Earth battery — An Earth battery is composed of a pair of electrodes made of two dissimilar metals, such as iron and copper, which are buried in the soil or immersed in the sea. A device that is placed in water is labeled a sea battery . It can act as a receiver …
108Purr — For other uses, see Purr (disambiguation). A purr is a sound made by all species of felids and is a part of cat communication. It varies between cats (for example by loudness and tone), and from species to species, but can be characterized as a… …
109Interlocking — In railway signaling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. The signaling appliances and tracks are sometimes collectively… …
110Science and invention in Birmingham — Birmingham is the second largest city in the United Kingdom. It is one of the country s principal industrial centres and has an impressive history of industrial and scientific innovation.16th century1547: Although no record is kept to indicate… …
