on a Kew Construction. 593 



tliree signals for each. The only remedy for this at first 

 seemed to be,' increasirv'g the number of combinations of the 

 telegraphs already established by adding more bodies, as, 

 for instance, toconstrnet an Admiralty telegraph with seven, 

 eight, or nine bodies instead of six ; but this remedy is only 

 partial, because additional bodies would run into confusioa 

 before the signal code can be enlarged to a sufficient extent. 

 On further consideration it therefore occurred to me, that 

 it might be allowable to propose anew diurnal telegraph; 

 and it" my preceding observations are granted, I hope it may 

 meet with approbation, being capable of exhibiting seven 

 hundred and seven thousand two hundred and eighty distinct 

 combinations, whereas no former one used in this country 

 has exceeded sixty-three. I now proceed to describe the 

 nature of the telegraph proposed, which, for the sake of 

 distinguishing it from others on a more cdftfined principle, 

 I shall call the Polygrammatic Telegraph. 



Nature and Construction. 



Four upright posts are erected, each having two arms 

 moveable on a spindle at top, which in their natural po- 

 sition hang down, but can be raised by means of strings 

 to various degrees of extension, so as to appear in positions 

 either vertical, horizontal, or inclined at an angle of 45° 

 with the horizon. The length of the arms may be about 

 six feet from the centre of motion to the ends, or more, in 

 proportion to the distance between the telegraphic stations. 

 The strings will be worked by two men. 



The combinations of two arms in the several positions 

 enumerated arc twenty- eight,' of which a table is given in 

 Plate VIII: eighteen of these are allotted to the alphabetical 

 charactprs, and ten to the numerical ciphers, so that using 

 the conimou mode of signal making, every post with its 

 arms might form a complete telegraph, were it not the ob- 

 ject of the present proposal to go further. A book is there- 

 fore made of word* and sentences arranged in regular order, 

 to the extent judged necessary, aud let signal 2507 signify, 

 for example, " The cneini/ have landed on the soulk-ivest 

 coastf" and let signal 9304 signify, *^ A convoy is just ar- 



T 3 rii'vd 



