[Fig. 43] shows the coherer tied on to a glass tube, by which it is supported.
Fig. 43
(Fig. 7 of Slaby’s book).
[Fig. 44] shows the simplest form of its connection to a one-cell battery A and a polarised relay B, which switches on another battery of several cells a operating the Morse instrument or electric bell or sounder b and also the tapper-back c, the hammer of which raps gently on the coherer tube at every signal.
Fig. 44
(Fig. 8 of Slaby’s book).—
Slaby’s arrangement of Coherer and of tapper-back and relay connections.
The actual apparatus is depicted in two views, Figs. [45] and [46], where will be recognised on the left-hand side the coherer and tapper-back; in the middle the batteries, both for relay and for coherer circuits; and on the right-hand side a relay and the signalling or calling instrument, in this case shown as an ordinary electric bell.
Fig. 45
(Fig. 16 of Slaby’s book).—