Binsreégnitc:depmeasis wit Bipwinatia, 8Y 
Having asserted thus much of the magneto-electric ‘machine, 
it will be necessary to allude briefly to the objections to machines 
for saan ate na where the galvanic battery i is the primum 
mobile. 
First. _The opposing currents produced € at and break~ 
ing the battery circuit cannot be separated, or rather cannot be 
united to form one current. In the magneto-electric machine, 
the alternating currents are made. ta flow. in the” same direction 
by the pole changer, or more. ! nection, the wni- 
trep. Asit is desirable that every distinct and useful apparatus 
should have an appropriate name, f have ‘selected the term Uni- 
trep, as short, and descriptive of the use of this part of the mag- 
—heto-electric machine. This important addition to the machine. 
appears to be beyond: simplification, consisting merely of two 
nearly half cylindrical pieces of metal, rivetted or secured in any 
manner to the circumference of a small disc of wood or ivory, 
and insulated from each other. Itsuse, as the name Unitrep 
implies, is to convert, or turn contrary currents. into one com- 
mon channel. 
Secondly.—In the galvanic an machines, a 2 
tro-chemical effects can be obtained (to any considerable degree) 
only by distinct impulses, occurring at each rupture of the cir- 
cuit. 'These- impulses or secondary currents closely resemble a 
common electrical discharge, and are of too short duration to 
allow the particles of the substances to be decomposed to assume 
definite polar arrangement. Nor-can the circuit be broken rap- 
idly to any advantage ; for in the first place, the full magnetiza- 
tion of the iron requires appreciable time, and, secondly, the. 
flowing of the secondary through a completed circuit, weakens _ 
itself by re-magnetizing the bar: (this will be spoken of-in fu- 
ture.) In the pwre magneto-electric machine, water is decompo- 
sed far more rapidly by the continuous current than by breaking 
‘the circuit, by the primitive than the secondary current. The 
secondary furnishes the most powerful shocks, but the primitive 
possesses the greatest decomposing power. 
_ Compound E lectro- Magnet and Electrotome for Shocks, 
Sparks, Se. 
In the late numbers of Sturgeon’s Annals, I iin that Mr. 
Bachoffner has introduced the bundle of wires as superior to the 
