58 On the Electric Telegraph of Prof. Morse. 
suggested itself to electricians. ‘The arrangement described is 
however entirely impracticable through long ‘distances, and a cer- 
tain combination of circuits, requiring the aid of another instru- 
ment, becomes necessary. It is on the exclusive use of this in~ 
strument and this combination, that the value of the Morse patent 
is based. ‘The “receiving magnet” is simple in construction and 
effect. Fig. 2 repre- Pig: Be 
sents one form of it. on 
The electric fluid, at- 
tenuated, as it were, 
in the great extent of 
metallic conductor it 
traverses, would not 
perceptibly affect the 
magnet described as 
the foundation of 
the register, and this 
though a eee 
y be comparativ 
ly short taiey abet miles) and the battery fresh and pases: 
Not only would the magnetism developed be insufficient to 
form the mechanical operation of indenting the paper, but with ce 
most careful adjustment the armature would be scarcely moved. 
To render available this attenuated current, the receiving magnet 
is interposed, differing from ordinary electro-magnets i in the great 
length and fineness of its helix, 3000 feet of the finest covered 
brought within inducing distance from the soft iron, which thus 
becomes a tolerably vigorous magnet, although the inducing cur- 
rent may be extremely feeble. The armature of this magnet is 
attached to a lever susceptible of delicate vibration and adjust- 
ment, an adjustment often rendered constantly necessary from the 
inconstant power of the current. The immediate use of this little 
instrument is the rapes « es closing of a circuit, consisting of 
the register magnet, a small — with sufficient Wire to con- 
3 represents this arrangement and the veintiotie of the 
atteries and circuits; RM representing the small mag- 
net, withe main circuit of indefinite extent, MB the distant bat- 
tery, K the key which breaks and closes this extended circuit ; 
