- Thomson, Sir W., lighthouse signals, 194;
- size of atoms, 195;
- tides, 450;
- capillary attraction, 614;
- magnetism, 665;
- dissipation of energy, 744.
- Thomson and Tait, chronometry, 311;
- standards of length, 315;
- the crowbar, 460;
- polarised light, 653.
- Thomson, Sir Wyville, 412.
- Thunder-cloud, 612.
- Tides, 366, 450, 476, 541;
- velocity of, 298;
- gauge, 368;
- atmospheric, 367, 553.
- Time, 220;
- definition of, 307.
- Todhunter, Isaac, History of the Theory of Probability, 256, 375, 395;
- on insoluble problems, 757.
- Tooke, Horne, on cause, 226.
- Torricelli, cycloid, 235;
- his theorem, 605;
- on barometer, 666.
- Torsion balance, 272, 287.
- Transit of Venus, 294, 348, 562.
- Transit-circle, 355.
- Tree of Porphyry, 702;
- of Ramus, 703.
- Triangle, arithmetical, 93, 182.
- Triangular numbers, 185.
- Trigonometrical survey, 301;
- calculations of, 756.
- Trisection of angles, 414.
- Tuning-fork, 541.
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