222 
THE TELEGRAPH 
lator is used and an electrophorus is dispensed with. The arma¬ 
tures of the mouse mill are arranged like the staves of a cask, and 
they supply the accumulators of the inducing apparatus. The 
motion of the mill is communicated by an axle and pulleys to the 
apparatus for unrolling the registering paper. The axle is kept 
in its place by vertical guides that are moved by the end so as 
to transmit no vibrations. 
A commutator of peculiar form allows the connection of 
the transmitting and receiving apparatus to be changed, and 
by means of suitable shunts, the registering apparatus can 
be made to mark the signals sent as well as the signals 
received. 
Fig. 158 shows the general appearance of the apparatus. 
Adjustment of the Paper .—The paper enters on the right 
and comes under the spring a which keeps it stretched ; it 
then passes to the roller b, thence to a slightly convex guide- 
plate c, which gives it a vertical direction downwards and 
brings it immediately under the point of the siphon tt , and 
then it reaches the drawing-off roller d. It makes a quarter of 
a turn on this roller and passes out horizontally to the left. 
A second roller, e, presses the paper sufficiently to cause it to 
be drawn out by d. This roller is pressed by its supports 
against d, and the supports themselves are fixed to a copper 
frame turning on a strong horizontal rod, g. 
A lever, placed to right of g is pressed downwards by a 
strong spring, that causes the paper to be seized between the 
two rollers. This spring can be eased by means of an eccentric 
turned by the little handle/. 
To free the paper we must turn the handle/ to the left; the 
roller e then falls three or four millimetres and leaves the 
paper, which can then slide easily, and ceases to be unrolled, 
although the cylinder d may continue to turn. If, on the 
other hand, the handle / be turned to the right, the paper 
is again seized between the two rollers and it goes on unrolling 
again. 
The distance between the paper and the point of the siphon 
is regulated by turning the screw i, which causes the upper 
part of the apparatus to slide in a groove. The zero line, 
formed by the continuous flow of the ink, can also be brought to 
the exact centre of the strip, by means of the screw h, which 
