182 THE ELECTRIC TELEGRAPH. 



Otherwise the electro- chemical telegraphs are more conve- 

 nient in manipulating, and much more simple and inexpen- 

 sive as far as the apparatus goes, than the Morse. 



101. Bonelli 9 s Chemical Telegraph. The Chevalier Bonelli 

 has succeeded in the construction of a chemical telegraph by 

 which messages are transmitted automatically, and facsimiles 

 received at the station corresponding. 



Bakewell seems to have considered the employment of one 

 style as preferable to that of many ; but he, nevertheless, 

 mentions in his patent the possibility of using several. In 

 the notice of his patent, published in the Mechanics 1 Magazine* 

 he says : " Instead of one style for each cylinder, any con- 

 venient number may be employed, each isolated from the 

 others, and fitted with separate wires having their ends inlaid 

 in an ivory disc, so as to be isolated from each other." 



The apparatus of Bonelli consists of a long stage or rail- 

 road on a table, as shown in Fig. 95, on which travels a 

 waggon containing, on the left side of the lower half a box 

 of raised metal types, and on the right side of the upper half 



Fig. 96. 



a strip of chemically-prepared paper. Over the middle of 

 the railway is a bridge (shown on an enlarged scale in Fig. 

 96), under which the waggon has to pass when transmitting 

 or receiving a message. A A' are two buffers for receiving 

 the waggon at the ends of its journeys. Just in front of the 



* " Mechanics' Magazine," vol. 1. p 544. 



