Part 33

Boston Light, 164, 165, 166, 177

Bowditch, production of regenerative lamp by, 78, 79

Boy Scouts, 17

Bremer, 120

Bristol University, 252

Brush, 68, 159

Building, 8

Bunsen, 81, 85, 89, 148, 149

Bureau of Mines: cited on open flames, 234; 236

Burning-glasses, 19, 20. See also Lenses.

Butylene, 106

Byzantium, 34

Caesar, 163

Canada, 254

Candle-hour, defined, 215

Candles: progress and, 7; 25, 28, 29, 30, 33; religious uses of, 34, 35; as a modern light-source, 36, 37; ceremonial uses of, 38 et seq.; 44, 48, 57, 82, 97, 222, 299, 304

Calcium, 107, 108

Carbolic acid, 106

Carbon: 53, 80, 81; physical characteristics of, 80, 81; 90, 104, 105, 128, 129, 144, 170

Carbon filament: 127 et seq.; preparation of, 129, 130, 131; luminous efficiency of, 131, 132; lamps, 161; lamps in greenhouses, 250 et seq.

Carbons, formation of, 115, 116

Carbureted hydrogen, 75

Carcel, invention of clockwork lamp by, 54, 55

Cat-gut, 130

Ceria, 85, 101

Charleston, S. C., 185

Charcoal: 113; uses of, for electrodes, 115

Chartered Gas Light and Coke Co., London, 74