Figure 55 represents a top view of the machine. S is the barrel upon which is wound a cord, sustaining a weight which drives the clock train, and upon the same shaft with it is a cog wheel driving the pinion, _m_, on the shaft, T; and on the same shaft, T, is another cog wheel, driving the pinion, _n_, of the type wheel shaft, I′. K and K, are the helices of the large magnet, of which H and H are the soft iron arms. M, M, M, M, are the blocks which support the instrument. F and F is the lever, _a_ and _a_ its adjusting screws; _x′_ and _x′_ its axis; _k_ and _k_ are the two upper coils of the two electro magnets at the back part of the instrument for purposes hereafter to be described; _x_ is the wire soldered to the plate buried in the ground; _p_ is the wire proceeding to the battery; _c_ is the connecting wire of the two electro magnets, _k_ and _k_; w is the support of the pendulum; _v_ is the escapement wheel; A is the type wheel; D and D is the printer, and B the roller over which the paper, P, is carried. [Illustration: FIG. 55.] [Illustration: FIG. 56.] Figure 56 represents a back view of the instrument; _k_, _k_ and _k_, _k_ are the coils of two electro magnets, surrounding the soft iron bars, _d_, _d_ and _d, d_; _b_ and _b_ are the flat bars through which _d, d_ and _d, d_ pass, and are fastened together by the screw nuts _c, c_ and _c, c_. The right hand electro magnet is fastened to the blocks, M and M, by the support, _f_ and _f_; from which proceeds a bolt passing between the coils, _k_ and _k_, and the block, _h_, with a thumb-nut upon it, by which the whole is permanently secured. In the same manner the left hand magnet is secured to the block, M. R′ is the outside portion of the brass frame containing the clock work. W is a standard fastened to R′, for supporting the pendulum, Y. X, Y, and _l_ are parts common to a chronometer for measuring the time, viz. the escapement and pendulum. The escapement wheel has 24 teeth, corresponding in number with the type on the wheel, and such is the arrangement of the parts, that when the pendulum is upon the point of return, either on the right or left hand, a type is directly over the paper, and the armature, _g_, is near the face of one or the other of the magnets; so that, if an impression is to be made with the type, thus brought to the paper, the pendulum, Y, is ready to be held by the magnet at the same time from making another swing until the type has performed its office, which will be hereafter explained.