336 
INDEX. 
T. 
Tahiti , tide observations at, 55. 
Terrestrial magnetism, contributions to, No. IV. Second series of magnetic determinations by 
Captain Sir Edward Belcher, R.N., 113. 
, No. V. 1. Observations within the Antarctic Circle, 
made on board Her Majesty’s Ships Erebus and Terror, in the summer of 1840, 1841, in the 
expedition under the command of Captain James Clark Ross, R.N., 145. 2. Observations 
between Kerguelen Island and Van Diemen Island, made on board Her Majesty’s Ship 
Erebus, July and August 1840, 173. 
Tide observations at Otaheite, or Tahiti, 55. 
Tides, on the laws of individual tides at Southampton and at Ipswich, 45. 
V. 
Voltaic battery, on the gas, 91. 
circuit, an account of several new instruments and processes for determining the constants 
of a, 303. Electro-motive force, 304. Reduced length of a wire, ibid. Rheomotor, 306. 
Rheometer, Rheotome, Rheotrope, Rheoscope, 307. Rheostat, 309. Standard of resistance, 
311. The resistance coils, 312. Process to ascertain the sum of the electro-motive forces 
in a voltaic circuit, 313. Processes to ascertain the resistance or reduced length of a rhe- 
omotor, 318. Instrument for measuring the resistance of liquids, 320. The differential re- 
sistance measurer, 323. Process to determine the degrees of deviation of the needle of a 
galvanometer corresponding to the degrees of force, and the converse, 327. 
W. 
Water, on the electricity evolved by the friction of (and steam), against other bodies, 17. 
Wheatstone (Charles, Esq.). An account of several new instruments and processes for deter- 
mining the constants of a voltaic circuit, 303. 
LONDON: 
PRINTED BY RICHARD AND JOHN E. TAYLOR, 
RED LION COURT, FLEET STREET. 
