INDEX 



189 



Characteristic curves: 



foralternating-currentarc, 106, no. 

 Chencveau, 51. 

 Color of: 



flaming arc, 54. 



mercury arc, 88. 



carbon arc, 126, 142. 

 Conductivity of arc, see Resistance. 

 Consumption of electrodes, 49, 139. 

 Cooling of electrodes, 46, 185. 

 Cooper Hewitt, 87, 95, 103, 120. 

 Cooper Hewitt mercury vapor lamp, 



89. 



Copper electrodes, arc between, 62. 

 Corbino and Liga, 37. 

 Cored carbons: 



manufacture of, 9. 



characteristic curves for, 14. 



anode drop with, 24. 



cathode drop with, 24. 

 Cores, composition of, 9. 

 Counter E.M.F. of arc, 10, 25. 

 Crater: 



definition of, 4. 



temperature of, 40. 



area of, and current, 48. 



area of, and candle power, 129. 



intrinsic brightness of, 132. 

 Cunningham, 165. 

 Current: 



and potential difference, see Char- 

 acteristic curves. 



oscillation of, with hissing arc, 21. 



with different phases of alternat- 

 ing-current arc, 107. 



rectifier, 120. 



and candle power, 130. 



D 



Davis, 159, 173. 

 Davy, 6, 50, 62, 74. 



Definition of: 



arc, i. 



anode, 4. 



cathode, 4. 



characteristic curves, 12. 



ions, 156. 



electrons, 156. 

 De la Rive, 46, 74. 

 De la Rue and Muller, 74. 

 Dewar, 41, 51. 

 Discharge in vacuum compared with 



arc, 2. 

 Discovery of: 



carbon arc, 5. 



mercury arc, 88. 

 Distribution of light with: 



direct-current carbon arc, 128. 



alternating-current carbon arc, 



136. 



Dubs, 38. 

 Duddell, 15, 28, 32, 116, 136, 148, 



152. 



Duddell and Mar chant, 22, 112. 

 Duncan, Rowland and Todd, 73. 

 Dynamical characteristic curves, 16, 



no, 151. 

 Dyott, 68. 



E 



Edlund, 9, 25, 35, 62. 

 Efficiency of arc, see Candle power. 

 Electric force in arc: 



in air, 24. 



in vacuum, 78. 



mercury arc, 97. 



theory of, 173. 



variations of, 184. 

 Electrodes: 



arc between carbon, 8. 



manufacture of, 8, 56. 



consumption of, 49, 139. 



