CONTINUOUS CALCULATING MACHINES. 
387 
And 
Then by integration 
or 
de v = 
al 
2 irbk 
6d0 
<\= ~ & 
1 47 rkb 
*= 
Thus suppose to and n are the respective final readings on the recording dials 
connected with the rollers A and B, the initial readings having been zero—suppose 
also that the pitch of the screw is such that the constant quantity is equal 
to unity. 
Then 
to 
— \/n 
that is, by turning B through a distance recorded on its own dial as n, the reading (to) 
on the dial of A gives the square root of the former quantity. 
Fig. 22. 
Fig. 23. 
