At present the process has only been commercially applied with
charcoal fuel, but experiments are stated to have shown that equal
success can be obtained with coke. The secret of the process lies in the
construction of the furnace, which is said to be simple and inexpensive.
* * * * *
THE MENGES THERMO-MAGNETIC GENERATOR AND MOTOR.
We have received from M. Menges (of the Hague) a most interesting
description of an apparatus on which he has been at work for some time
past, with the object of generating electricity by the direct conversion
of heat, or, as it might be more accurately described, by a more direct
conversion than that of an ordinary dynamo. M. Menges' apparatus
depends, like that of Edison, upon the fact that the magnetic metals
lose their magnetic permeability at a certain temperature.
It differs greatly, however, from its predecessor in important points,
especially in the fact that it does not require the aid of any external
source of motive power.
In Edison's pyromagnetic dynamo it will be remembered that it is
necessary to provide some small amount of motive power from an
extraneous source in order to revolve the shield by which the heat is
alternately directed on one half or the other of the armature cores. M.
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