KEY AND INDEX 



Constructed his first locomotive in 1800. Be- 

 tween 1801 and 1803 he ran road locomotives 

 about London, carrying passengers. He con- 

 structed a high-pressure threshing engine in 1812 

 His plunger pole pump, invented in 1797, super- 

 seded all others for deep mining, and is still in 

 use. 



Tuke, Dr. William, iv, 245. Born at York, in 

 1732; died in 1822. English physician and phi- 

 lanthropist. Remembered particularly for his 

 revolutionary method of caring for the insane, 

 freeing them from chains, and allowing them 

 greater liberty than heretofore. 



Tycho, Brahe, ii, 65. Born at Scandia, Sweden, 

 Dec. 14 (O.S.), 1546; died at Prague, Bohemia, 

 Oct. 24 (N.S.), 1601. Celebrated Danish astron- 

 omer; among the most famous of star-gazers. He 

 did not accept the Copernican doctrine in full, 

 regarding the earth as an exception to the other 

 planets which have the sun as their center of 

 motion. 



Tyndall, John, iv, 175. Born at Leighlin 

 Bridge, Ireland, Aug. 21, 1820; died at Hasle- 

 mere, Surrey, Dec. 4, 1893. Distinguished Brit- 

 ish physicist. Especially noted for his popular 

 exposition of scientific subjects, and for his im- 

 portant investigations in electricity, heat, light, 

 and acoustics. He devoted much time to the in- 

 vestigation and study of glaciers, and wrote ex- 

 tensively concerning them. He was an ardent 

 champion of the Darwinian theory from the time 

 of its promulgation. 



Van Helmont, Jean Baptista, ii, 185. Born at 

 Brussels, 1578; died at Brussels, Dec. 30, 1644. 

 A Flemish chemist and physician. He con- 



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