LIST OF ILLUSTRATIONS 



PACE 



Portion of the Electrical Exhibit in the UniLed States National Museum. . viii 



Otto Von Guericke's Electric Machine, 1650 2 



Voltaic Pile, 1799 4 



Faraday's Dynamo, 1831 8 



Pixii's Dynamo, 1832 9 



Daniell's Cell, 1836 10 



Grove's Cell, 1838 n 



Grove's Incandescent Lamp, 1840 13 



De Moleyns' Incandescent Lamp, 1841 14 



Wright's Arc Lamp, 1845 15 



Archereau's Arc Lamp, 1848 16 



Starr's Incandescent Lamp, 1845 18 



Staite's Incandescent Lamp, 1848 19 



Roberts' Incandescent Lamp, 1852 19 



Farmer's Incandescent Lamp, 1859 20 



Roberts' Arc Lamp, 1852 21 



Slater and Watson's Arc Lamp, 1852 21 



Diagram of " Differential " Method of Control of an Arc Lamp 22 



Lacassagne and Thiers' Differentially Controlled Arc Lamp, 1856 23 



Serrin's Arc Lamp, 1 857 24 



Siemens' Dynamo, 1856 25 



Alliance Dynamo, 1862 26 



Wheatstone's Self -Excited Dynamo, 1866 27 



Gramme's Dynamo, 1871 28 



Gramme's " Ring " Armature 28 



Alteneck's Dynamo with " Drum " Wound Armature, 1872 29 



Lodyguine's Incandescent Lamp, 1872 30 



Konn's Incandescent Lamp, 1875 30 



Bouliguine's Incandescent Lamp, 1876 31 



Jablochkoff " Candle," 1876 2~ 



Jablochkoff's Alternating Current Dynamo, 1876 2^ 



Wallace-Farmer Arc Lamp, 1875 34 



Wallace-Farmer Dynamo, 1875 34 



Weston's Arc Lamp, 1876 35 



Brush's Dynamo, 1877 36 



Diagram of Brush Armature 36 



Brush's Arc Lamp, 1877 7,y 



Thomson-Houston Arc Dynamo, 1878 38 



Diagram of T-H Arc Lighting System 39 



Thomson-Houston Arc Lamp, 1878 40 



Thomson Double Carbon Arc Lamp 40 



IMaxim Dynamo 41 



Sawyer's Incandescent Lamp, 1878 42 



Farmer's Incandescent Lamp, 1878 42 



Maxim's Incandescent Lamp, 1878 43 



Edison's First Experimental Lamp, 1878 44 



