THE ELECTRIC LIGHT. 165 



therefore, restrained by the condition of the light 

 and the apparatus to a certain sized lamp. At 

 Teignmouth, some of the revolving lights have 

 ten lamps and reflectors, all throwing their light 

 forward at once. But even with ten lamps and 

 reflectors we do not get sufficient light, and we 

 want, therefore, a means of getting a light more 

 intense than a candle in the space of a candle 

 not merely an accumulation of candle upon 

 candle, but a concentration into the space of a 

 candle, of a greater amount of light, and it is here 

 that the electric light comes to be of so much 

 value. 



Let me now show you what are the proper- 

 ties of that light which make it useful for light- 

 house illumination, and which has been brought 

 to a practical condition by the energy and con- 

 stancy of Professor Holmes. I will first of all 

 show you the image of the charcoal points on 

 the screen, and draw your attention to the spot 

 where the light is produced. There are the 

 coal points. The two carbons are brought 

 within a certain distance ; the electricity is 

 being urged across by the voltaic battery, and 

 the coal points are brought into an intense 

 state of ignition. You will observe that the 



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