Upon the stock below the little wheel was a small plate of copper, which lifted up and shut down, and was fixed by its two legs, with two screws to the two sides of the stock; this was a back-sight; it was pierced above by two little holes, one over the other, and when the plate was raised, these two holes answered to a globule, which was a small bead, no bigger than that of a chaplet, that was suspended at the end of the cross-bow by a fine wire, and fastened to two perpendicular columns of iron, one on the right, the other on the left, and this little globule, answering to the holes in the plate, served to direct the aim, whether for shooting horizontally, upwards, or downwards.
The cord or string of the bow was double, each string separated by two little cylinders of iron, equi-distant from the extremities of the bow and the centre; to these two strings in the middle was fixed a ring of cord, which served to confine it in the notch previously mentioned when the bow was bent. Between the two cords in the centre of the string, and immediately before the ring, was a little square of cord, against which was placed the extremity of the arrow or dart, to be pushed forward by the cord.
The smaller cross-bows were bent with the hand; the larger ones were at first bent by the soldier placing his foot in a stirrup, attached to the end of the bow; a cord was then fixed by one end to the butt of the stock, the other end being fastened to a waistbelt. A pulley, running upon the cord, was hooked to the bowstring, and the bow was then bent by raising the body and keeping the leg firm.
The cross-bow was afterwards furnished with the moulinet and pulleys, (plate 13) which after the bow had been bent, could be removed for the discharge; these consisted of an iron cylinder in a frame of the same metal, made to turn by two moveable handles in opposite directions, and having a cap likewise of iron to fit on the butt end of the stock. On each side of this cap was a small pulley, the wheel of which was one inch and a half in diameter, having attached to one of its arms a strong cord that passed thence round an equal sized wheel, returned over the first, and then went round one double in diameter, situated beyond the second, and so passed to the cylinder of the moulinet, by winding which, the power required to bend the bow was lessened to one fourth. Attached to the arms of the greater wheels was a double claw, made to slide on the plane of the stock, which, catching hold of the bowstring, drew it up to the nut. An improvement of the moulinet was, that the handles of the cylinder were both made in the same line, instead of being one up and the other down.