SO ernest 
Miscellanies. 193 
4. Davenport’s Electro-Magnetic Machine.—Since the notice 
of this invention in the April number of this Journal, the proprie- 
tors have been engaged in experiments on magnets of different mod- 
ifications, as well as on the proper distance between the magnetic 
poles of the circle. The form and arrangement of the magnets 
have been entirely altered, and the energy of the machine greatly 
increased. The proprietors have discontinued the use of magnets 
in the form of segments of a circle and now use them in something 
like the horse shoe form, changing the poles once in every 31 inches 
of the circle. On this arrangement, a machine with a wheel seven 
inches in diameter, (being but a trifle larger than the one formerly 
described in this Journal,) elevates ninety pounds one foot per min- 
ute, and will perform about twelve hundred revolutions in the same 
A machine has also been constructed with a motive wheel one 
foot in diameter, which moves with great energy, but its power has 
not been tested by the elevation of weights. One of the machines 
with a motive wheel only seven inches in diameter, bas been attached 
to a turning-lathe, and moves it with astonishing strength, compared 
with the small size of the propelling engine. 
The experiments and improvements hitherto made serve to 
strengthen the hopes at first entertained in regard to the value and 
importance of this invention. 
The proprietors are now engaged in constructing a machine with 
a motive wheel of about 2: feet in diameter, from which they ex- 
pect to obtain sufficient power to propel a Napier printing press. 
For the purpose of raising funds to carry on experiments, &c., a 
joint stock association has been formed in New York, of which Mr. 
Edwin Williams, No. 76 Cedar street, is agent. By this arrange- 
ment the principal interests of the patent for the United States and 
Europe, being placed in a stock of 3000 shares, the proprietors 
offer an opportunity to public spirited individuals to become asso- 
ciated with them in the enterprise, which it is hoped, for the benefit 
of mankind, may prove successful. A sufficient number of shares, 
we learn, have been already taken to provide ample funds for experi- 
ments on a liberal scale, and the public with interest wait the result, 
g Pamphlet on Electro-Magnetism.—A pamphlet of ninety four 
| pages has been published in New York, containing a history of Da- 
venport’s invention—notices of it from periodical publications, and 
Vou. XXXII—No. |. 5 
