376 SEC. 10. ELECTRICITY. 



1700. Magneto-electric Railway Passenger Signalling 

 Apparatus. Geminiono Zanni. 



This is for enabling the passenger in any part of a railway train to com- 

 municate with the guard or driver by simply touching a button, without the 

 use of a voltaic battery. 



1702. Magnetic Bells and Signals. Geminiano Zanni. 



In the above the mechanical electric bell moved by clockwork, at present in 

 use, is dispensed with. The motion of the coils is caused by moving a bell-pull 

 lever half a revolution. Self-acting apparatus may, by this invention, be 

 arranged for giving alarm in case of fire or burglary without the use of a 

 voltaic battery ; by adopting clockwork to set the coil in motion, the bell or 

 signal would act on opening a door or window, or by the heat resulting from 

 fire. 



1673. Electric Domestic Bells (three). ,/. Hound. 



1674. Electric Detective Bell. J. Round. 



1728a. Electrical Communicator. Garnkam $ Co. 



This invention enables a perfect communication to be maintained between 

 guards and drivers, and passengers and guards, by means of electricity. The 

 want of a thorough system of communication between guards and drivers on 

 trains has long been felt, as it is well known that the guard in the after 

 part of a train cannot at all times hear the driver's whistle. By means of this 

 electrical communication a perfect code of signals can be maintained. In the 

 case of danger, passengers can readily give an alarm to the guard, and this 

 passenger signal continues ringing until the guard replaces it, and it therefore 

 indicates the compartment of a train in which the alarm bell was sounded. 

 The apparatus consists of a simple battery with the necessary communicators ; 

 it is simple, inexpensive, and not liable to get out of order, and is also readily 

 applied to all existing trains. 



1576g. Magnetic Bell, with tell-tale. 



The British Telegraph Manufactory, Limited. 



1702 a. Electrical Alarum with Leclanche's Battery. 



Mariais, Paris. 



This apparatus consists of a watch placed on a box which contains an 

 electrical bell worked by two elements of a chloride of ammonium (called 

 Leclanche's battery). The wire from the zinc is fixed in the binding screw 

 No. 2, the wire from the carbon in the binding screw No. 1. When the small 

 hand of the watch touches the piece which turns in the circular groove, the 

 bell rings until the hand is released by turning the small handle which is at 

 the side of the piece. The binding screw No. 3 which is above is to be used 

 for the wire from the carbon when the apparatus is used as an ordinary electric 

 bell. The polished stem which carries No. 4 binding screw can only be used 

 for six hours, when the rod which carries the platinum point is clamped in 

 the hole. 



1702b. Lamp with Self-lighting Electrical Apparatus 

 and Bichromate of Potash Battery. Mariais, Paris. 



The battery inside is charged with bichromate of potash mixed with about 

 one-tenth water. The lamp, the small tube of which can be seen, is an ordinary 



