Gases, expansion of, 33 



logs, of (1 -f -00367<), 27 

 mass of, 56 

 molecular data for, 32 

 refractive indices of, 34 

 .specific heats of, 25 

 Geological formations, 79 

 Gravity, values in England, 14 

 nbroad, 13 



Hardness, scales of of water, 65 

 Heat, mech. equivalent of 32 



latent, 26 



of chemical action, 7077 



of combustion, 77 



specific, 2325 



unit of, 32 



Heating effects of currents, 44 

 Heights and depths, 83 

 High water, times of, 85 

 Horse power, 20 

 Hydrometer scales, 66 

 Hygrometer wet-bulb table, 30 



Joule, a, 44 



Jorle's equivalent, 32 



Julian period, the, 91 



Latent heats, 20 



Latitude and long, of towns, 86 



length of 1' and 1 of, 87 

 Length, measures of, 8 

 Lengths of curves, 7 

 Light, velocity of, 35 

 Logarithms, 100 



of factorials, 6 



of (1 -f -003670 27 

 Longitude and time, 8 



length of 1' and 1 of, 87 



Magnetic chart of England, front. 

 Magnetisation, intensity of, 52 

 Magnetism terrestrial, 5355 

 Measures, ancient, 12 



English and metric, 811 



less usual, 12 

 Melting points, 23 

 Mensuration, 7 

 Mercury, tension of vapour of. 31 



volume and density of, 2:> 

 Molecular weights, 56 



multiples of some, 65 

 Moon, dimensions of the, 90 

 Morse's alphabet, 52 



Ohm, the, 43 



TT, its powers, &c. 7 

 multiples of, 1 

 Pendulum, length of the, 13 

 Pole star, declination of the, 01 

 Potential diff. of, on contact; 45 



Quartz, elasticity of, 96 



Radian, 8 



Radii of gyration, 94 

 Reciprocals, 1 

 Refractive indices, 34 

 Resistance, B. A. unit of, 43 



of cables, 49 



insulators, 50 



liquids, 49 



metals, 48 



non-metals, 49 



Siemens' unit of, 4:i 



specific, 47 

 Rigidity, 16 

 Rivers, lengths of, 82 

 Ropes, strength of, 18 

 Rotary polarisation, 34 



Secants, Sines, 4 



Solar system, the, 90 93 



Solubilities, 56 



Spectra, 33 



Specific heats, 2325 



Squares, Square roots, 1 



Strata, succession of the, 79 



Strength of materials, 17. IS 



Surface tension, 95 



Tangents, 4 

 Tenacity, 17 

 Tension of aqueous vapour, 29 



mercury vapour, 31 

 Thermo-electricity, 51 

 Thermometers, comparison of. 2-2 

 Tides, 84, 85 

 Time, 8 

 Towns, latitude and longitude of, 8(3 



Units and angles, and time, 

 C. G. S. 38 

 dimensions of, 38 

 electro-magnetic, 40 

 electrostatic, 40 

 English and metric, 811 

 magnet, 39 



practical electrical, 42 

 relation of electrical, 41 



Vapour, aqueous mass of, 31 

 tension of, 29 

 mercurial tension of, 31 

 of liq. gases, tension of, 26 



