Sd!> 0/7 the Esialtishmeni of Telcgrapttis 



Tliese are supposed to be kept constantly burning whilst 

 the telegraph is worked ; and being hid or shown at pleasure 

 by means of blinds, thev form forty-one distinct combina- 

 tions or-signais; the combinations of six bodies, which should 

 properly be sixty-three, being reduced to this number by 

 the ambiguitv arising from its being impossible to ascertain 

 the relative places of objects bv nisiht as bv day. 



The constructioH of the telegraph will be understood by 

 conceiving six large lanlhorns attached to a strong frame of 

 timber, placed in the upper room, or on the roof or terrace 

 of a building ; in which latter case it may be protected by 

 a shed from the injuries of the weather. Each of these 

 lanthorns will contain a lamp, the intcnseness of whose 

 fight must be proportioned to the distance between the tele- 

 graphic stations, upon which the distance of the several 

 lanthorns on the frame from each other will also depend. 



Every lanthorn must have two blinds, one on each side 

 of it ; to which will be fastened strings passing through the 

 ceiling of the signal-room, and guided by pulleys to a con- 

 venient place below, where they can be worked by a single 

 man. The blinds are so luing, that in their natural state, 

 "when the telegraph is at rest, all the lights are hid except 

 the middle one of the lower row, which serves to guide the 

 eye of the observers, and is therefore called the standing 

 light, being always exhibited during the intervals between 

 successive signals. 



The Key, 



In the table of combinations, or kcv of the telegraph an- 

 nexed, it will be observed, that after leaving one for the stand- 

 ing light, and assigning thirty combinations to denote the let-- 

 ters ofthealphabct, numerical cvphers, 8cc., the ren)ainingten 

 places are left blank. It is needless to explain the use of the first 

 thirty signals, which are capable; of cnmnunv.calint; every 

 kind of intelligence alphabetically. In a manner which nui-t 

 be evident on inspection*. I have only therefore to point out 



* The li t of numbers appropriated to tiie several )-.i;rnr.ls is nnt to be con- 

 sidered a part of the key, althuii;,'-h t liave found it convenient to i-.iscrt them 

 there. They arc .if use only in the nicclianical operation of v/orkiiig the te- 

 legraph, when every string being nnnibered, they serve to show wliich of 

 them m-.ist be pulled, in order to make the respective iignyls. 



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