414 Newellian Sphere. 
and easily traced, and their positions readily determined, by 
reference from the machine to the heavens, which no other 
contrivance of the kind has ever been known to represent. 
Fifthly. The adaptation of time, as an impelling power, 
in such manner that similar artificial and natural phenomena 
are produced at coincident times. 
Sizthly. The machine, notwithstanding its bulk, is very 
_ portable ; the silk envelope being readily folded up, the ar- 
millary circles easily revolved into the same plane, and the 
projecting arms of the planets disengaged without incon- 
venience ; the whole secured in an appropriate case, without 
occasioning any derangement to the parts, or requiring any 
separation of the wheel work of the machine. 
Such are the principal points of superiority which it isbe- 
lieved this machine possesses over that constructed by Dr. 
Pearson. The mean periodic times of the planets are, it is 
allowed, pointed out to a closer degree of exactness by 
Doctor’s contrivance ; but the difference is so trifling, in 
comparison, as to be more than counterbalanced by the supe- 
rior advantages which the sphere has been shown to possess 
in other respects. Of the actual value-of the machine, how- 
ever, an enlightened public are yet to judge. From the gene- 
ral approbation which has been bestowed on the original con- 
trivance, by men of acknowledged talents and scientific ac- 
‘quirements, it is confidently believed, that in its present much 
improved state, it will be found still more deserving of their 
attention, and will receive a proportionably greater share of 
patronage and support. 
To the inventor, Mr. Newell, much praise is certainly due 
for the zeal he has displayed in the cause of science. _ In de- 
ciding upon the merits of the invention, these considerations 
should enhance its value, and serve as powerful inducements 
to rermunerate him, promptly, for some portion of the time 
and expense devoted to this object. _ 
4 
