_Junction Box for Multiple Cables._--At Fig. 43 is represented a plan of lower half of this form of junction box. It consists of a pair of cast iron plates of precisely similar form to the one shown at Fig. 43, and so made as to be capable of being fastened tightly together by means of four bolts and nuts passing through the holes _a_, _a_. The grooves _b_, _b_ at the two extremities are just large enough to grip the armoured cable firmly, when the upper and lower parts are screwed together. A larger space is provided in the hollow for the joint. _Junction Box for Single Cored Cables._--For this purpose a junction box similar to, but smaller than the one above described is employed. _T Junction Box._--This form of junction box is employed when the system of electrical contact mines on branches from a single cable is used. This system is dependent on the use of a platinum wire fuze in connection with a platinum wire bridge in each branch close to its junction with the main cable. This form of junction box, which is shown at Fig. 44 is very similar to the one used for the connection of two multiple cables, only differing in its shape, which is that of a T. _a_ is a disconnector, which will be described further on; _b_, _b_, _b'_ are the armoured electric cables, _b_, _b_ being the main, and _b'_ the branch cable in connection with the forked joint formed within the T junction box; _c_, _c_, _c_ are Turk's heads formed to prevent any strain being brought on the forked joint. This form of Turk's head is made by turning back the wires of the cable armouring, and frapping them round with spun yarn until the necessary size and shape is attained. _McEvoy's Turk's Head._--Another form of Turk's head, devised by Captain McEvoy, is shown at Fig. 45. It consists of two separate pieces of brass, _a_ and _b_, the former screwing over the latter. The mode of using it is as follows:-- Slip the piece of brass _b_ over the cable _c_, and turn back the wires of the cable _d_, _d_, &c., so that they lie against the shoulder of the brass piece _b_, then slip the other piece of brass _a_ over the cable and screw it on the piece _b_, firmly jamming the turned back wires _d_, _d_, &c. This is a very neat and quick method of forming a Turk's head, and it should be invariably used in preference to the foregoing method, which is clumsy, and which takes some time to form.