166 Description of a Hand Drill Machine.[March,

wáit the aririval ofa lighter wheel from the foundery, to make a second essay: in the mean time, I beg leave to offer you the inclosed sketch of it, as the form will remain the same, though the dimensions and weight of apparatus will be less than of the one I have had on trial. A few words by way of expla- nation, will perhaps be necessary. A, is a small leyer of wood, four feet long, whose elbow, or fulchrum, moves on a pivot at B. Itis A A that if the pulley C be forced up to the nave of the wheel by the spring X, the spokes will catch the pegs D D, and force the pulley round with it. An inch- wide strap of leather turns the other pulley E, which stands on an iron spindle squared at the part on which it is placed; the rest of ît is rounded. At every turning at the land’s end, by pressing the lever with the left hand towards the shaft G, the biggest end of it communicating with the pulley C, by means of the iron H,(which IL shall describe afterwards,) slips it along the round axis of the wheel sideways an inch or two, uil the pegs D D are out of reach of the spokes, and therefore cease their revolutions, leaving the seed barrel at rest. The wheel is of cast iron, not weighing more than 61bs; diameter 20 inches; its rim outwardly convex, and concave within, about 2x inches wide. An iron scraper at I cleans it every revolution. The shafts of the barrow should not be more than 15 inches asunder at the axis, rather wider at the other extre- mities. The nave of the wheel is very small, with a bore in it, one inch square, to receive the axis, which 1s squared to fit it in the middle; the remaining part is rounded, that it may turn freely in the iron center N. The cups which are pre- cisely the same as used in Cooke’s drill, are nailed upon two wooden cylinders, diameter 2 inches and length,(being the width of the seed vessel and hopper,) not exceeding five inches.'These two cylinders are bored through with an half inch auger, to admit the spindle O. Thus, when it is re- quired to change the cups, the spindle is withdrawn, and another cylinder put in its place, and fastened with a pin or screw passing through both cylinder and spindle. The seed vessel P holds about half a peck,(sufficient to sow three or four rows in a square piece of four acres,) and is raised or lowered by a pin at R, according as it feeds too slow or too fast. A tin slide within also regulates the quantity to be sown. In the centre of the pulley C is an iron collar, see ig. 2; the part S being of the thickness of the pulley, and let into it, the rest of it projects, and the iron H, fig. 3, clasps the rounded part of it loosely. Thus, when the spokes catch the pegs D D, the neck T turns round in the cavity M; and when the lever slides away the pulley sideways out of the reach of the spokes, the iron H keeps it out of the way of them, and therefore at rest. The shafts of the machine‘are