604. IMPROVEMENT OF k

at the bottom than at the top, and thefe pieces of tin, when bent down, muft exa@ly fit them.

Lafily. When all thefe holes through the tin-cylinder are thus en- larged, and the bits of tin filed rather narrower at their projeétino ends, and then bent down into the excavations of the wooden cylin-

der, the other end ofthe tin cylhnder with its fquare focket may be {oldered on.

And now when the end of the tin cylinder at A is prefled forwards upon the wooden cylinder towards B, by turning the fcrew at x above defcribed; every excavation of the wooden cylinder will be gradually leflened, and finally quite clofed; by which eafy means they may be adäpted to receive and deliver feeds of any fize from horie-beans and peas to wheat, barleÿ, and to turnip-feed, with the greateit accuracy, fo as to fow four, five, or fix pecks on an acre, or more or lefs, as the agricultor pleafes, by only turning the fcrew a few revolutions one way or the other.

Obfervations.

1. In the conftru@ion of the tin and wooden cylinders beneath the feed-box another fmall improvement may be neceflary in fowing very fmall feeds, which is this: As the fcrew at the end À is turned,{o as to contra all the excavations of the wooden cylinder, the furface of the wooden cylinder for one inch from thé end of each excavation towards the end B, Plate XI. Fig. 4. will become bare without being covered by the tin cylinder; and on thefe bare parts of the wooden cylinder, which will be one inch long, and half an inch wide, fome fmall feeds may chance to ftick, and evade the brufhes, which fhould prevent them from pafling, as the cylinders revolve.

To prevent this, when the wooden cylinder is fo placed within the tin cylinder, that all the holes are quite open, let à piece of the tin

cylinder

ES