EP wy 
326 New Publications. 
plan. After this hiftorical introdu@tion, the author deferibes 
the properties of a good telegraph. 'Thefe are: 1{t, perfec- 
tion in regard to the combination of the chara&ers and the 
property of the fions; 2d, perfection in regard to eafinefs of 
movement and ufe. : Thefe properties, the author fays, are 
united in that of Chappe. His telegraph confifts of three 
arms, the inclination of which towards each other, towards 
the perpendicular poft, and towards the horizon, give cer- 
tain pofitions that reprefent the old Runic letters, or the oldeft 
alphabets, and by their combinations 256 pofitions of parti- 
~-eular figns are poffible. - In September 1794, the author be- 
gan to make experiments in Sweden, before he was ac- 
~“quamted with a complete defcription of the French) tele- 
sraph ; and he contrived various forms, fome like the French 
and fome entirely different, till he at Jeneth fell upon that 
- which he here defcribes, the combination and ufe of which 
are attended with great advantages. A defcription of it 
swithout the figures would require too much time. | It is pro- 
~-perly a fort of lattice with ten apertures in three vertical 
rows, which can be opened and fhut by means of boards*, 
“-and which are capable of forming 1024-combinations or dif- 
tinét fignals. Thefe, in order to be eafily diftinguithed and 
“repeated, are expreffed by fiewres arranged in tables: fub- 
~ Joined’to the work; fo that, with thefe 1024 figns, it is pof- 
fible to reprefent 2097152 variations of the figures... For 
; fignals’’ ‘in the night-time a lamp is applied behind each 
ile, she covered or uncovered as may be neceflary. 
ale .Ty s cmc to be onthe fame principles swith thofe-adopted in England. 
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