Newellian Sphere. 113 
dent and satisfactory, than could possibly be done by the best 
diagrams, with the most familiar explanations, in the same 
space of time. : 
In introducing an invention to the notice of the public, 
and requesting their patronage, it is necessary that they be 
assured there is merit in the contrivance, and that it possesses 
advantages over others that have been designed for the same 
object. With regard, then, to the Newellian Sphere, we 
‘conceive that it has merits which none other, at present in 
use, is found to possess. The one selected for a comparison, 
is that recently constructed by Dr. Pearson, of Edinburgh, 
it being generally acknowledged to be, both in the simplicity 
of its contrivance and the accuracy of its motions, much su- 
perior to those of Martin, Ferguson, &c. which have been 
generally used in our seminaries of learning. The Newel- 
lian Sphere, it is believed, is superior to Pearson’s machine, 
in the following respects : 
First. In simplicity of contri 1 mechanical arrang 
ment of parts. 
Secondly. The plane of the ecliptic being vertical to the 
horizon, the motions of the planets correspond more exactly 
with their real motions, and consequently is. 
from one to the other with greater ease. go Se 
Thirdly. The inclinations of their orbits to the great stan- 
dard, the ecliptic plane, is produced; the planets, in Pear- 
son’s machine, all moving horizontally in the same plane. 
Fourthly. The fixed stars, constituting an important por- 
tion of the visible universe, are represented. The paths of 
the planets in the firmament, are consequently pointed out 
VOL, XU.—NO, 1. 15 : 
