An account of the Electro-Magnetic Engine. 127 



electro-magnetism in Bavaria, and this new power has already realized 

 the most sanguine expectations. A locomotive is also propelled by- 

 it. 



It is therefore to be expected that electro-magnetism will soon play 

 an important part, and unquestionably supersede steam, which is so 

 much more dangerous and expensive, and every other power with which 

 we are as yet acquainted. Stoehrer is convinced that, with 100 zinc 

 elements, as above mentioned, (equal to forty-five horse power,) he 

 can propel a train of waggons with the usual number of passengers, 

 from Leipsic to Dresden on the railroad, at an expense of but 

 six shillings, whilst the expense at present is about five pounds 

 sterling. 



We thus arrive at a standard of the extraordinary economy and 

 power of these new machines : notwithstanding their immense power, 

 they, can, nevertheless, be instantly stopped by a child ; nothing 

 further being necessary to stop the machine than to lift the connecting- 

 rod out of the vessel. 



The extent by which this power may yet be, and must in time 

 be perfected is sufficiently clear, from the fact of its being applicable, 

 with the greatest advantage, for grinding, turning, spinning, and in- 

 numerable other mechanical processes. 



We feel therefore justified in calling the attention of mechanics to 

 this novel power ; and we hope by the aid of the drawings (which 

 we have taken principally from Jacobi) to enable any one to get such 

 machines made. Herr Stoehrer, in Leipsic, undertakes to construct 

 such machines. 



The following has been selected from an article in the Polytechnisches 

 Centralblatt, which we doubt not will be read with interest. 



On Electro-Magnetic Machines. By Emil Stoehrer, of Leipzig, 

 Mechanician. 



Tt would seem as if the construction of electro-magnetic machines was 

 regarded as a secret everywhere, inasmuch as different means are 

 employed to attain the same end each person is entitled to protection 

 for all that is peculiar in his mode of construction. But, since the 

 laborious efforts of Messrs. Jacobi and Lenz, in St. Petersburgh have 

 succeeded in defining the laws which govern the strength and power of 



