en a Neiv Construction. . 209 



For supposing that only nine of the blanks are used to 

 refer to sections of words and sentences arranged according 

 to the foregoing method, then the tenth blank may de- 

 note that '' The three ensuing signals are to be read in a 

 third part," which may be added to the signal-book, and 

 may contain '-'7000 places of words and sentences, each of 

 ^vhich will be represented by four changes on the telegraph. 



So that supposing we have six sections in part the first, 

 three sections in part the second, and one only in part the 

 third, we might form, if necessary, a code of signals consist- 

 ing of . ■ 



Part 1st. 

 6 X 30 = ISO words and sentences that may be ex- 

 pressed by two changes on the tele*- 

 graph. r 



Part 2d. 

 3 X 900 = 2700 words and sentences that may be ex- 

 pressed by three changes on the tele- 

 graph. 

 Part 3d. 

 1 X 27000 = 27000 words and sentences to be expressed 

 Total 298SO by four changes on the telegraph. 



The manner of arranging the signals in this system by 

 sections is, strictly speaking, numerical ; but as we carry 

 our combinations as far as 30, not stopping, as usually prac- 

 tised, at the number 10, it may in some respects be more apt- 

 ly compared to the disposition of words in a dictionary. 



In the first part, the places in each column are regularly 

 numbered from 1 to 30. 



In the second part, (containing what may be called the 

 double signals,) the first place of each section is numbered 

 1, 1, the second i, 2, the third 1, 3, and so on up to 1, 30 : 

 after which begins, 2,1, 2,2, 2,3, SiC, &c., up to 

 30, 30; which is the 900th, and last place of the section. 



In the third part, if necessary, containing the triple sig- 

 nals, the first place is numbered 1, 1, 1, the second place 

 1, 1, 2, 8cc., 8cc., up to 1, 1, 30; after which commences 

 1, 2, 1, 1, 2, 2, 1, 2, 3, &c. ; and if this were carried to 

 its utmost extent, the last place, numbered 30, 30, 30, would 

 be tiic 27000lh in regular order. 



Vol. 2<J. No. 115. Dec. I8O7. O 



