[ ^33 ] 



with one man to work it, and another at the telefcope with a 

 fmaller vocabulary, are fufEcient. With this reduced apparatus 

 we can with eafe fpeak at the rate of one word per minute to a 

 great diftance, as the time loft by intermediate flations is but 

 fmall. 



The vocabulary correfponding with the numbers denoted by 

 this machinery is compofed of a large book with mahogany 

 covers, framed, to prevent them from warping. Its fize is 47 

 inches by 21. It confifts of 49 double pages, that is to fay, 

 each fheet is folded in the middle, where it opens from one 

 page. 



The book is divided into feven parts, confifting each of feven 

 pages, by thin flips of mahogany, which ferve to open it eafily 

 at each of thefe divifions. Every one of thcfe feven divifions 

 contains feven pages, and each page contains forty-nine words. 



No more than forty-nine words are contained in a page, be- 

 caufe the numbers 8 and 9 and zero are omitted. This omif- 

 fion arifes from the ftru(flure of the machinery, which points 

 only to feven numbers, referving O for a point of reft, at 

 which point the hands indicate nothing. In every hundred, 

 therefore only forty-nine numbers are ufed ; and in every thou- 

 fand only feven hundred is counted. Each divifion of the book 

 feparated by the mahogany rulers contains all the efficient 

 numbers in feven himdred. Each of thefe rulers projeds 



(Plate 



