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POPULAR SCIENCE REVIEW. 
them as much as possible of the full power of the magnetism. 
The top and bottom of the coil are attached to vertical stretched 
wires i e , which serve to keep the coil stiff and form an axis 
round which it is free to oscillate, while they at the same 
Fig. 1. 
time serve to lead the electricity coming from the cable into 
and away from the coil. These wires are kept stretched by 
such a sensibly constant force as an adjustable spring or 
arrangement of weights properly attached can give. The 
siphon is connected to the coil by a light fibre /, and this fibre. 
