the rack is thrown back a distance corresponding to the width of two of its teeth. This requires two revolutions of the gathering pallet to return it to its place; and these two revolutions of the pallet and the wheel which carries it govern the two blows on the bell which signify the hour. At three o'clock the third step of the snail will be presented to the hammer-tail, and so on. On the next page is an illustration of the back part of a French Clock, as seen upon opening the door of the case. At the right hand side will be observed the count-wheel A, fitting tightly upon a prolonged square arbor of the second wheel in the train, and having twelve openings of unequal length around its outer edge, 1, 2, &c. Just above the wheel towards the right will also be seen the 'Dog,' or 'Detent,' F, which falls into these notches, and is a part of the locking similar to that which is represented at the stud and the pin H. So soon as the stud is lifted the pin becomes disengaged, the wheel-work revolves, and the count-wheel being firmly fixed to the prolonged arbor of one of those wheels, advances with it in the direction indicated by the arrow, the detent resting upon the plain part of the locking-wheel. When the required number of hours have struck, the notch approaches the detent, the gravity of which allows it to fall therein. +----------------------------------------------------------------------+ | [Illustration: Back of French Clock.] | +----------------------------------------------------------------------+ In connection with this detent is also another projecting piece, which is carried inside the frame, and when it falls presents a broad surface to a pin fixed in the rim of one of the wheels. Thus the motion of the wheel-work is stayed until this piece is again lifted by the going parts from the pin, and held in that position by the outer rim of the locking-wheel A, until again the next notch is presented to the detent. When it falls, the stud is carried with it, against which the pin becomes engaged. The number of strokes depends on the distance which the count-wheel has to revolve before being stopped by the detent F. The chief objection to the locking-plate being used for striking, arises from the fact that, if ever the clock is allowed to run down, or if the clock gets otherwise stopped, it strikes wrong afterwards, until it has been properly re-set to the hour. Clocks are made of all manner of shapes, patterns, and sizes, for all manner of places, positions, and persons. BRACKET CLOCKS, which are intended to occupy but a small space, say on a staircase, or lobby, or landing, are sometimes made with extreme finish, care, and elegance, sometimes are simply plain and devoid of embellishment. They are constructed with or without striking work.