An account of the Electro- Magnetic Engine* 129 



Experiment has shown that this secondary product fully covers the loss 

 of zinc incurred during the same time. By employing one element, 

 which does not cost more than three-half-pence daily, 1440 pounds 

 may be raised to a height of three feet in twelve hours. A battery and 

 machine, to suit technical purposes is regulated as follows : 



1. By lifting up the connecting- wire the whole action is suspended, 

 and all motion instantly ceases. 



2. Arrangements are made so that the machine can work with any 

 intermediate power from the minimum to the maximum, without its con- 

 suming a greater quantity of blue vitriol than is exactly requisite for 

 the power required. 



3. A battery can continue for twelve hours in perfectly equable ope- 

 ration, provided that the vitriol be supplied once a day. 



4. The solution always remains in the holders of the battery in a 

 saturated state, so that the machine may be instantly set in motion by 

 the inserting of the zinc, and without its being necessary to resort to a 

 new solution of the vitriol. 



5. The battery is free from the inconvenience of generating noxious 

 gas, so that the machine may be set in operation in a room, without 

 causing the slightest smell of any kind. 



6. Arrangements may be made for the removal of the precipitate of 

 copper from time to time, and so applied to any purpose. 



7. When the machine is not in action, the zinc can be easily re- 

 moved, and suspended over the machine : no cleansing is necessary 

 until the zinc be completely dissolved. 



If we can no longer doubt, after the experiments of Messrs. Jacobi 

 and Lenz, that the effect of the electro- magnetic machines increased 

 in proportion to the squares of the number of the elements of the bat- 

 teries, they must, when executed on a large scale, prove very economi- 

 cal, independent of the outlay of capital and the cost of repairs being 

 so much less than with steam-engines. 



A power which can raise two pounds weight three feet high in one 

 minute, will raise six pounds one foot high in the same time. As only 

 one element of the battery is required to effect this, let this be consi- 

 dered as unity, and the first member of the following progression, 

 which may serve as the basis of the construction of electro-magnetic 

 machines. The dimensions of the whole machine must naturally be in 

 proportion to the increase of the elements. Since, according to Jacobi, 

 the power of the machine increases with the quadratic relations of the 

 number of elements, it is clear iikewise, that the power may be in- 



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