Incandescent Lamps, —— number obtained per electrical HP., 8. —— illustration of, 11. —— candle-power of, 11. —— consumption of energy in, 10, 63. —— life of, 11. —— blackening of, 12. —— at Temesvar, 63. Lighting, —— number of hours of, per annum, 4. —— cost of, to London householder, 5. —— diagram of, in London district, 6. —— diagram of, at Cincinnati, 7. —— diagram of, 13. —— relative cost of, with direct and transformer system, 22. —— relative cost of, by electricity and gas, 91. Lucigen light, the, 99. —— cost of working, 100. Machinery at Grosvenor Gallery, 29. Motors, Electric, 39. —— diagram showing power supplied to, in Boston, 40. —— purposes used for, in America, 39. Meters, Electric, —— the Edison, 49. —— the Aron, 54. Mackenzie’s conduits for electric light cables, 95. Priestman’s petroleum engine, 98. Regulation of E. M. F. at Grosvenor Gallery, 29. Regulation of E. M. F. at Milan, 44. Rent of meters at Milan, 49. Rent of meters at Berlin, 53. Regulators for secondary batteries, 76. Resistance of Copper Wire, 105, 106. Speed indicators at Grosvenor Gallery, 29. Safety fuses at Grosvenor Gallery, 31. Safety fuses at Milan, 47. Switch, double pole, 72. Table I. showing cost of laying conductors, 74, 75. Table II. showing cost and maintenance of plant, 86, 87. Table showing resistance, &c., of copper wire, 105, 106. Table showing principal electric lighting stations in Great Britain, 116-119. Table showing principal electric lighting stations on the Continent, 120-125. Terms, explanation of, 107-115. Transformers, —— application of, 27. —— diagram of Ruhmkorff type of, 23. —— description of Ruhmkorff type of, 23. —— arrangements of circuits of, 24. —— two classes of, 24. —— Kapp & Snell, 27. —— distribution of electricity by means of, 21. —— prevention of shocks from, 30. —— Westinghouse converters, 35. —— potential used in, 38. —— direct current, 79. —— comparison between alternate and direct current, 80. —— Swinburne’s dynamotor, 83. —— advantages of Zippernowsky-Deri system of, 34. Turbines working the dynamos at Tivoli, 32. Turbines working the dynamos at Lucerne, 33. Useful Notes, 101-103. —— incandescent lights, 102. —— arc lighting of works, 102. —— approximate cost, 102. —— wire running, 103. —— Electrical Measurements, 104. Westinghouse system, 35. —— at Pittsfield, 37. Wires overhead or underground, 91. [Illustration] LONDON: PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, STAMFORD STREET AND CHARING CROSS. THE HOUSE-TO-HOUSE Electric Light Supply Co., Ld.