The specification also contains figures of earth-connected forms of radiators, with or without self-induction coils, of which Fig. 28 may be here reproduced; and likewise a modification of the point coherer depicted in Fig. 17, on page 22 (_see_ Fig. 29, and also fig. on page 27), where the spiral wire spring is replaced by a piece of straight watch-spring, clamped at one end, adjusted by a screw at the other, and lightly touched by a needle point at its middle; a very gentle tapping back stimulus being provided in the form of a clockwork or other mechanically-driven motor grazing lightly against one end of the spring protruding beyond the clamp for the purpose. [Illustration: FIG. 30 (Fig. 14 of Specification 11,575/97).--Another diagram of connections for Syntonic Receiver, with Coherer in a secondary or transformer circuit; a conducting or a capacity shunt for the telegraphic instrument being applicable as before.] [Illustration: FIGS. 31 and 32 (Figs. 5 and 6 of Specification 18,644/97).--Modes of connecting a Coherer to one or to a pair of Syntonic Radiators so that it may feel their _electrostatic_ disturbance.] [Illustration: FIG. 33 (Fig. 11 of Specification 18,644/97).--Actual connections for a Sending and Receiving Station on the plan shown in Fig. 37. Left-hand side shows spark sending, right-hand side shows Coherer receiving.] Fig. 30 shows a coherer inserted in a secondary or transformer circuit, and operated inductively by the oscillations of the receiver, which are thus transformed up and raised in potential. (2) No. 16,405, 1897, wherein are described chiefly various practical methods of decohering, by means of cams and otherwise, which are appropriate when working rapidly with automatic transmitter and siphon recorder. (3) No. 18,644, 1897, represents different ways of connecting up a coherer to a syntonic resonator, so as to get the benefit of its overflow without interfering with the working up of the electric oscillations, _e.g._, Figs. 31, 32 and 33. It also shows a plan for constantly decohering by a rapidly revolving cam a number of coherers in parallel, so that one at least is always ready to receive an impulse (Fig. 34). Further, it arranges to utilise the earth or a cable sheath, or other uninsulated conductor, for the purpose of conveying electric impulses to a distance (Figs. 35, 36, 37 and 38). And next it is arranged to assist the coherer to feel the full effect of any electric jerk by shunting out the battery and galvanometer, which are necessarily in series with it, by means of a condenser of moderate capacity (Fig. 35), which also shows a self-induction mode of sending a stimulus along an uninsulated line. This condenser obstructs all steady currents, such as give the signal, but it transmits freely any momentary electric impulses, such as stimulate a coherer. [Illustration: FIG. 34 (Fig. 1 of Specification 18,644/97).--Single-point Coherers in parallel, with successive decoherence.]