[ 3i6 ] 



The portable telegraph refembles that which I have defcribed 

 It differs only in two circumftances ; for convenience, as it is fmall 

 and does not oppofe much furface to the wind, it may be dif- 

 tended with ribs of wood inftead of cords. 



The portable telegraph which my fon had the honour of fhew- 

 ing to His Royal Highnefs the Duke of York in Kenfington 

 Gardens in Odober laft, was furnifhed w'ith filken cords, on 

 purpofe to (hew how my larger telegraphs were conflrudled ; but 

 it was intended merely for reconnoitring near an army, and was 

 only fix feet high. 



Iw the effay which the Academy has already received I faid 

 that imitations without end might be made of my telegraph. 

 Every index or pointer that moves circularly, dividing an imagi- 

 nary circle into parts and denoting figures or figns that corref- 

 pond with a vocabulary, is founded on the fame principle as mine. 

 The French have laid afide their former clumfy apparatus, and 

 have conftru fled a telegraph on thcfe principles; and the admi- 

 ralty in England have as I am informed very lately done the 

 fame. 



The firft pointers I employed in 1767 were wind-mill fails, 

 I then tried indexes of the fiiape (fig. 5.) Fig. 8. A pointer 

 like a fword-cutler's fign was recommended to me by a member 

 of the Academy, as a fecond or additional hand to move on the 



fame 



