The lips were directed by four similar levers; one of which opened them to give the air a freer passage; another contracted them; a third drew them backward, and the fourth pushed them forward. The remaining lever was employed in the direction of the tongue, which by its motion shut or opened the mouth of the flute. The varied and successive motions performed by this ingenious androides, were regulated by a contrivance no less simple than efficacious. The axis of the steel cylinder or barrel was terminated by an endless screw composed of twelve threads, above which was placed a small arm of copper, with a steel stud made to fit the threads of the worm, which, by its vertical motion, was continually pushed forward. Hence, if a lever was moved, by a peg placed on the cylinder, in any one revolution, it could not be moved by the same peg in the succeeding revolution in consequence of the lateral motion communicated by the worm. By this means the size of the barrel was considerably reduced; and the statue not only poured forth a varied selection of instrumental harmony, but exhibited all the evolutions of the most graceful performer. No. XCII. A screw, made like a water-screw, but the bottom made of iron-plate spadewise, which, at the side of a boat, emptieth the mud of a pond, or raiseth gravel. NOTE. The Archimedean screw, though hitherto only applied to the raising of water, appears to be equally applicable to many other purposes; as the procuring of sand from pits, taking dry goods of small dimensions from carts or barges, clearing rivers, &c. though in that case it will be necessary to make the lower end of the machine in a conical form, gradually increasing the size of the orifice from the point to its upper extremity, in order to prevent the materials from clogging the screw, which would otherwise occur. The _dredging machine_ worked by a steam-engine, and employed in the Thames for a similar purpose, is well known. No. XCIII. An engine, whereby one man may take out of the water a ship of five hundred tons, so that it may be caulked, trimmed, and repaired, without need of the usual way of stocks, and as easily let it down again. NOTE.