Y e

1803] Improvement of the Drill Plough 87

delivered as the axis revolves, without any of them being cut or bruised. i

Construction of the iron aris and wooden cylinder beneath the seed box. An iron bar is first made about four‘feet sìx inches in length and an inch square, which ought to weigh about fifteen pounds."This bar is covered with wood s0 as to make a cylinder four feet long and two inches in diameter, aSat lk io 3. The uSe ol the 1r0n bar Ini the centre@l the wood is to prevent it from warping, which is a matter of great consequence. This wooden cylinder passes. beneath ihe bottom of the sced box, and has a cast iron cog-wheel at one end of its axis, as at rr, which is one-fourth of the dia- meter of the correspondent cast iron wheel, which is fixed on the nave of the carriage wheel, as at ff, Fig. 1. so that the axis of the seed box revolves four times during every revolution of the wheels of the carriage. In the perephery of this wooden cylinder are excavated four lines of holes, sIx in each line, as at n, n, n, n, n, n; a second line of ex- cavation is made opposîte to these on the other síide of the cylinder, and two other lines of excavations between these 3 s0 that there are in‘all twenty-four excavations in the wooden part of this axis beneath the sced box, which exca- vations receive the corn from the seed cells as the axis revolves and deliver it into the flues shewn in Fig. 2. ooü. The size of these excavations in the wooden cylinder to re- ceive the seed are an inch long, half an mch wide, and three- eighths of an inch deep; which are too large for any seeds at present employed in large quantities except beans, but have a method to contract them to any dimensions required, by moving the tin cylinder over the wooden one, as ex- plained below.

Construction of the tin-cylinder. AB at Tig. 4. represents a cylinder of tin an inch longer within than the wooden cylinder on the iron axis at Fig. 3. and is of two inches dia- meter within, s0 as exactly to receive the wooden cylinder, which may slide about an inch backwards or forwards within it. CD, are two square tin sockets fixed on the ends of the tin cylinder to fit on the square part of the iron axis which passes through the wooden cylinder at( Fig. 3. on which they slide one inch backwards or forwards. The fol- lowing directions in making the holes in this tin cylinder, and those in the wooden cylinder which are to correspond with them, must be nicely attended to,---First, when the tin cylinder 1s soldered longitudinally, and one end of it sol- dered on as at À, sìx holes through it must be made longi- tudinally, on four opposite sìdes to it; each hole must be eractly half an inch wide, and five-eighths of an inch long; the length to be parallel to the length of the cylinder. The