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there ; then the hand may be brought into the policion re- 

 quired, by placing the index below on the number to be re- 

 prefented ; and thus any perfon, though not acqviainted with 

 the fignals, can work the machine without danger of error, and 

 fignify the numbers with almofl: as much difpatch as they 

 could be written. The form of one of thefe pullies with the 

 ropes for working the hand is feen in the drawing at A^ and 

 the three remaining hands are underflood to be furnifhed with 

 fimilar machinery. 



It may be ufeful to obferve that it is not neceflary that the 

 correfpondents flhould underftand any common language, for if 

 they be furniflaed with vocabularies in their own refpcdlive 

 tongues, and if the fame fymbols be referred in each to a word 

 of equal import, every correfpondent will underftand it through 

 the medium of his own tongue, and the fymbols will anfwer 

 the purpofe of an univerfal language for thefe, and alfa for other 

 communications. 



I 



