Description of an improved Telegraph. 343 



diopiri/jue da AT. Euler, et mise a la Portee de tons ies 

 Onvriers en ce Genre.'' This work ought to be in the hand* 

 of every optician : but jt is scarce in France, having been 

 printed at Petersburg. 



Artists will learn, from the above book, the advantages and 

 changes which it is important to observe in the use of a 

 kind of glass with a greater dispersive power than that of 

 flint glass. But these inquiries are interesting to opticians 

 only, and are foreign to the labours of M. Doufourgerais, 

 who seems to us to merit in every respect the encouragement 

 and protection of the Government, as well as the approbation 

 of the Institute. — Signed De Prony, Guyton, Rochon. 

 loTbe : Class approves of the above report, and assents to its 

 conclusions. 



Signed, Delambre, perpetual secretary. 

 ■' 

 . . . ~~ ' ~" 



L.XI.I. Description of an improved Telegraph, By Major 

 Charles Le Hardy, of the Island of Jersey*. 



XJLaving discovered a mode of communicating by signals, 

 which to me seems to unite every advantage that can be ex- 

 pected for that mode of communication, I beg leave to trans- 

 mit to you a plan of it, and to write a few explanatory lines 

 upon the subject. 



The telegraph, of modern invention, is an improvement 

 on communication by signals, which has been in use for 

 many ages. Monsieur Chappc was, I believe, the first who 

 proposed a machine for that purpose, which was put in ex- 

 ecution about the year 1793. Since that time several modes 

 have been proposed by different persons, none of -which 

 seem to have fully attained the object. A machine of this 

 kind should be simple, and easy to comprehend. All those 

 which have come to my knowledge are executed by com- 

 binations, which render them too complicated for common 



* From Transactions of the Society for the Enconrageme?* nfAus, Mam/fa r- 



ture, and Commerce, for 1808. The silver medal of the Society was voted 



to Major Charles Le fclardy for this communication. 



. Y 4 use> 



