+ 
Intelligence and Miscellanies. 363 
very wasteful manner. It is even thought that the earth 
which has already passed through their hands, would, by care- 
ful management, yield another product as greatas that which 
they obtained in the first instance. Very little of the dust is 
collected, nor is the business reduced to any system e 
have great need of a few ingenious —— to invent Jabor- 
saving and economical machines for u 
5. Pettengill’s Stellarota—The Rev. Amos Penttengill 
of Salem, Coun., has contrived a very ingenious instrument 
for the use students of alae pen to which he has given 
the name of rue sTELLAROTA. It is in fact.a moveable plan- 
isphere, and afhatie me a very chea ic wrate,* many of the fa- 
cilities for studying the heavenly bodies, usually supplied only 
by — globes. 
elestial maps are apt to produce much confusion in the 
mind of the young learner; and since the appearance of the 
heavenly bodies, which they oe does not correspond 
to their actual position at any given time, - _— in 
studying the constellations is Tittle aided by t On the 
contrary, the celestial globe is capable of sia an adjust- 
ment, as to bring the stars, as delineated on its surface, to 
correspond with the actual appearance of the concave, at 
the very moment when he is viewing it. Various astronom- 
ical problems also of the most instructive kind can, as is well 
known, be performed on the celestial globe, which cannot 
be wrought on the common maps or planispheres. But the 
stellarota is capable of being adjusted to the time and place 
in the same manner as the globe, and affords the means of 
solving nearly all the problems that can be wrought on the 
latter. 
This instrument consists of a disk or circular card seven 
and a half inches in diameter, fixed into a circular opening 
- the ere eeesisions; cut in a thin epee 7 slab of 
take their respective stations around it. In order t gander. 
stand the manner in which these are sev erally laid down, let 
us take an orange, and mark on its rind circles representing 
ge seme ee 
* The price of the instrument ‘neatly framed, does not exceed two dollars. 
