KEY AND INDEX 



hills, Scotland, 1763; died at London, March 22, 

 1831. British engineer and inventor. Studied 

 for the ministry, but later became a civil engi- 

 neer. He improved the steam-engine, and in 1802 

 he produced the steam tugboat "Charlotte Dun- 

 das," which was practical commercially. 



Tait, Professor P. G., iii, 291; v, 208. Born 

 April 28, 1831 ; died July 4 ,1901. Scottish physi- 

 cist and mathematician. Made extensive studies, 

 with Lord Kelvin, of the vortex theory of mat- 

 ter. Was an authority on quaternions, and made 

 many important investigations in heat and elec- 

 tricity. 



Talbot, William Henry Fox, i, 71. Born Feb. 

 n, 1800; died at Laycock Abbey, Wiltshire, Sept. 

 17, 1877. English antiquary. He discovered a 

 process of photography about the same time as 

 did Daguerre, and in 1841 invented the calotype 

 process. He was one of the first to decipher the 

 Assyrian inscriptions found at Nineveh. 



Tesla, Nikola. Born at Smiljan, Lika, Aus- 

 tria-Hungary, 1857. Physicist and electrician. 

 Came to the United States in 1884, and later be- 

 came a naturalized citizen. Invented the system 

 of alternating current power transmission, pro- 

 ularly known as 2-phase, 3-phase, multi-phase, 

 and poly-phase, in 1888. Has been actively en- 

 gaged in investigating wireless lighting systems, 

 and wireless means of communication. 



Thales, i, 103. Born at Miletus, Asia Minor, 

 about 640 B.C. ; died about 546. Greek astrono- 

 mer, and philosopher. He is said to have pre- 

 dicted an eclipse of the sun which took place in 

 the year 585 B.C. 



Theophrastus, i, 188. Born at Eresus, Lesbos, 



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