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Numbers, as one would pleafe, becaufe the Multi, 
plication of lb many Syftems would require too 
great a Force for one Operator to move fo many 
Wheels, kept by Springs, fuppofing the cafe that 
all the Teeth of Communication ihould duly catch } 
I own that this Objection is but too well ground- 
ed : However, I cannot help obferving at the 
lame time, that this Defeat can hardly be avoided, 
in any Arithmetical Machine, for performing all 
thofe Operations of itfelf, without the help of 
the Mind : For there mull certainly be a particular 
Syftem for each Place of Figures, which is to 
communicate with the next ; confequenly, as the 
Sy ftems encreafe in Number, the Force muft en- 
creafe alfo which is requir’d for moving them all. 
Befides, it ought to be confider’d, of what Size fuch 
a Machine ought to be, which might ferve for com- 
mon Ufe. I think few Calculations could be re- 
quired, for which 14 or 16 Syftems might not fuffice. 
That which I made was of 7 Syftems, as I have 
already mention’d. The Dilpofition of it was 
neither fo well contrived as I have explained it 
here, nor were its leveral Parts fo well wrought, as a 
good Artificer, who makes Profeflion of fuch Work, 
might have performed it ; yet thofe 7 Syftems were 
very eafily put in Motion ; and if in a Machine for 
14 Figures made by a skilful Hand, it could not be 
fo eafily practicable, this Defedt, I believe, might 
be eafily remedied, by applying the other Hand in 
the fifth or fixth Syftem to the Handle fs, in order 
to eafe and affift the Operator. 
I am your humble Servant , 
C, L. Gbrsten. 
N % 11 Of 
