[ 2 5 6 ] 
demonftration, that this machine by the appli- 
cation of more bars, may be extended to equations 
of all dimenjions , it may not, I think, be improper- 
ly called an Univerfal conjlruftor of Equations. Iam 
S I R, 
With great refpeft, 
your moft humble and 
moft obedient fervant, 
London, Efiex-ftreet, 
March 24, 1768. 
Rowning, 
XXV* A 
