Central-stations, —— Siemens’ suggestion for, 1. —— at Philadelphia, 2. —— block, 3. —— construction, 3. —— selection of district for, 4. —— relation between daily output and capacity, 7. —— loss in, 15. —— at Deptford, 31. —— at Eastbourne, 31. —— at Brighton, 32. —— at Tours, 32. —— at Vienna, 76. —— position of, 16. —— in United States, 17. —— at Grosvenor Gallery, 27. —— Kensington Court, 20, 68. —— methods of lighting from, 20. —— tables showing cost of, 86, 87. Cost of gas compared with electricity, 8. Cost of kerosene, 9. Cost of arc lighting, 10. Conductors, —— relative size of, for different systems, 22. —— arrangement of, at Grosvenor Gallery, 28. —— primary conductors at Grosvenor Gallery, 30. —— diagram of network system of, at Milan, 46. —— diagram of multiple series system at Temesvar, 60. —— conduits for, in New York, 92, 93, 94. Distribution of Electricity, —— Edison parallel system, 41. —— Edison feeders, 42. —— three-wire system, 43. —— series system, 52. —— Bernstein system, 57. —— multiple series system, 58. —— by means of secondary batteries, 65. —— system of, at Kensington Court, 69. Dynamotors, 79. —— Swinburne’s Compound, 83. Electric Lighting, —— as an investment, 3, 9, 97. —— people who most readily take it up, 4. —— relation between number of lights used and number fixed, 4, 5. —— cost of, to householder, 5. —— diagram of, in London district, 6. —— diagram of, at Cincinnati, 7. —— charges for, 8. —— description of arc and glow, 9. —— at Tilbury Docks, 18. —— at Victoria Station, 18. —— at Paddington Station, 19. —— relative cost of, for direct and transformer systems, 21, 27. —— at Lucerne, 34. —— at Milan, 34, 44. —— cost of, at Milan, 48. —— at Berlin, 52. —— cost of, at Berlin, 53. —— Bernstein system of, 55. —— diagram of, system at Colchester, 67. —— working cost of, at Athenæum Club, 88. —— working cost of, at Naval and Military Club, 89. —— working cost of, at South Kensington Museum, 89. —— working cost of Thomson-Houston system of, in an American city, 90. Experiment at the Teatro dal Verone, 34. Faults, discovery of, 51. Gas Lights, —— heat from, advantages and objections, 3. —— number used and fixed, 4. —— cost of, at Berlin, 53. —— cost of, to householder, 5. Glossary, 107.