TABLE OF CONTENTS. VU 



49. Values of 0.67451/— ^^^ — 36 



50. « " 0.67451/^^ 37 



51. " " o.84S3v/-r^ 37 



V n{fi — i) 



52. " *' 0.8453 r 37 



nWn — I 



53. " " the logarithm of the gamma function V{n) for values of n 



between i and 2 3^ 



54. " " the first seven zonal harmonics from 6=^0° to ^ = 90° ... 40 



55. " " log M/4TrVaa^ for facilitating the calculation of the mutual 



inductance between two coaxial circles 42 



56. " " / "^(i — sin"6s'm'^4))-^d4> for different values of $ with the loga- 



rithms of these integrals 43 



57. Cross section and weight of copper, iron, and brass wire of different 



diameters, British units 44 



58. Cross section and weight of copper, iron, and brass wire of different 



diameters, metric units 46 



59. Cross section and weight in various units of aluminium wires of differ- 



ent diameters 4^ 



60. Cross section and weight in various units of platinum wires of different 



diameters 5° 



61. Cross section and weight in various units of gold wires of different 



diameters 52 



62. Cross section and weight in various units of silver wires of different 



diameters 54 



63. Weight, in grammes per square metre, of sheet metal 56 



64. " " various British units, of sheet metal 57 



65. Size, weight, and electrical constants of copper wire according to Brown 



and Sharp's gauge and British measure 58 



66. Same data as 65, but in metric measure 60 



67. " " " " but British standard wire gauge 62 



68. " " " 67, but in metric measure 64 



69. " " " 65, but Birmingham wire gauge 66 



70. " " " 69, but in metric measure 68 



71. Strength of materials : 



(a) Metals and alloys 70 



(d) Stones and bricks 70 



(c) Timber 70 



72. Composition and physical properties of steel 71 



73. Effect of the reduction of section produced by rolling on the strength of 



bar iron 72 



74. Effect of diameter on the strength of bar iron 72 



