ELECTRIC LIGHTING. 



ment of the luminous point produced by a screw effects the 

 change. 



In some other experiments made with these apparatus at 

 Toulon and at Cherbourg an unexpected fact was esta- 

 blished, namely, that when the concentrated beam is pro- 

 jected upon a ship, the pilot has much difficulty to enter a 

 port. This is a new means of defence. 



It has been proposed to send signals from captive balloons. 

 In this case the signal regulator of De Mersanne may be 

 advantageously employed. 



Lighting of Railway Trains. The intense brilliance 

 of the electric light, and the easy method of throwing it in 

 any direction, have suggested in its employment for lighting 

 railway trains running at night, and for announcing them at 

 a greater distance were it only by the illumination of the sky 

 at the place they are passing. Experiments made on the 

 Chemin de fer du Nord have been perfectly successful, and 

 seem to indicate that this plan of lighting will one day 

 become general. In the meanwhile Girouard has invented 

 the following system. 



The electric generator, or Gramme machine, is fitted up 

 on the tender, and is driven by a toothed wheel moved by 

 an independent piston fixed on the lower part of the frame. 

 One of Watt's governors controls the admission of the steam. 

 A copper tube connected with a cock fixed on the engine is 

 coupled to a pipe leading to the slide valve of the motor 

 cylinder. In order to protect the magneto-electric appa- 

 ratus from rain and dust, it is enclosed in a wooden casing, 

 and only the cylinder remains outside. It will easily be 

 seen that this arrangement is very solid, although indepen- 

 dent of the engine. Its parts can be attended to by the 

 person who usually cleans the engine. 



In front of the locomotive there is firmly fixed a lantern 

 containing an electric lamp provided with a powerful re- 

 flector, and in front of the lantern is placed, at an angle ot 



