Now it will be obvious that when the rudder is turned in either direction these pins will come successively in contact with the said spring, and at each contact and separation the circuit will be made and broken, and an impulse will be transmitted through the cable, whereby a corresponding movement will be transmitted to the said index finger or pointer _x_** on the keyboard. The pole changer _s_^{4} is connected with another of the insulated wires of the cable, which on board the boat is connected with a shunt and set of magnets arranged in combination with the aforesaid cylinders that operate the said guiding rods, so that by sending the current in one direction the said rods will be raised, and by sending the current in the opposite direction the said rods will be lowered. The switch _s_^{5} is connected with another of the said insulated wires of the cable, which forms the circuit, including the aforesaid two resistance coils. By adjusting this switch the operator completes the circuit through the two resistance coils, and then, but not till then, the charge can be exploded, either by the operator, or by the action of the firing pin or rod when the same is driven in and cuts out the other resistance coils as above described. The resistance coil _X_^{1}, Fig. 124, is connected to the binding screws 9, 10 by the wires 7 and 8. These binding screws are in metallic connection with the two springs _X_, but otherwise they are carefully insulated. One pole of the fuze _Y_ is connected to the binding screw 10, the other put to earth through the body of the boat, as at _E_; the main wire 11 is connected to the binding screw 9. Now when the operator cuts out the resistance coil at the firing station, which is done by moving the switch _s_^{6}, the electric current is sufficiently powerful to ignite the fuze _Y_ through the resistance coil _X_^{1}, so that at any moment the torpedo may be exploded by the operator on shore, or by the contact between the torpedo and the attacked vessel the rod _V_ will be driven in, and, coming in contact with the springs _X_, will bridge over the space that originally existed between them and so cut out the resistance coil _X_^{1}, and the torpedo will be exploded automatically. _Capabilities of the Lay Torpedo Boat._--The capabilities of the Lay torpedo boat are as follows:-- 1.--It may be launched from the shore, a vessel, or a structure, and be kept under observation, and accurately guided or directed to the ship or other object to be attacked; and it may be exploded at any desired moment, or it may be caused to return to the original point of departure without being fired. 2.--It may be totally and instantaneously submerged to prevent its destruction or capture by the enemy, and it may be raised to the surface, as soon as the danger has passed, in a condition fit for immediate action.