G. B. Grant on anew Difference Engine. 117 
that the drivers belonging to the even orders are not released 
as the carriage comes back, but those belonging to the od 
orders, so that at the next stroke the even orders are added to 
draw it out when it springs back. As each nine on the wheel 
1 E the slip fis pushed out, and the catch 
P to the next place B drawn; and as the zero comes to E, the 
searing, ete., are omitted from the accompanying sketch, whic 
'S Meant merely as an outline drawing showing the principal 
arts only. 
_ The size of a completed machine would v with the capa- 
city. An engine of the sane capacity as that of Scheutz, 
Would be three feet long, twelve inches high, and eight inches 
Wide. The cost is estimated at from two to three thousand 
Cambridge, June 5, 1871. 
