yf I

Implements of Hufbandry— Drill-Machines, 15:

The great fimplicity of this improved machine confifts, the author obferves, firft,. In its having only a feed-box, and not both a hopper and feed-box as in fome others, as that of Mr. Cook; fecondly, in the flues which conduét the feed from the bottom of the feed-box into the drill-furrows not being disjoined in the middle, in order to permit the lower part to move to-the right or the left, when the horfe deviates from the line in which the coulters pafs, as in Mr. Cook’s machine, which in this is per- formed by a fimple univerfal joint; thirdly, in the horns or fhafts behind, between which the perfon goes who regulates the coulters, being equally fixed to the coul- ter-beam and the axle-tree, while in others, as that we have juft mentioned, they are all of them moveable joints, like a parallel rule for the purpofe of counteracting the {werving of the horfe, which is. here done by a fimple univerfal joint; fourthly, in altering the dimenfions of the holes in the axis of the feed-box, by fimply turning a{crew, fo as: to adapt them to all kinds: of feeds which are ufually fown on field lands; fifthly, in the{trong brufh of briftles which{weep over the excavations of the cylinders beneath the feed-box,{trickling them with fuch exaétnefs that no. fupernumerary feeds efcape, and.that none of them: be the leatt broken or injured, which is. the cafe in other machines, as the orginal one of Mr. Tull; and laftly, in its greater fimplicity rendering it lefs expenfive in its conftru€tion, and lefs liable to be out of repair, as well as the management of it more readily and more eafily underf{tood*.

In the fame ingenious and philofophical work the author alfo defcribes a feed-. box, the invention of Mr. Swanwick, of Derby, by which the feed may be depo- fited with ftill greater accuracy. This box is forty-eight inches long within;- which. {pace is divided into fix cells, for the purpofe of fowing fix rows of feed‘at the fame time, as in that juft defcribed; and at the bottom of each is a hole for the féed to pafs through into the feed-flues, but without any revolving axis, a wooden bar about four feet eight inches. long, and three-eighths. of an inch in thicknefs, through which there are fix perforations, each of them exactly one inch long, and half an inch: wide, and three-eighths of an inch deep, which is the thicknefs of the bar that fup- plies its place. The centres of thefe holes are exactly eight inches diftant- from each: other, correfpondent to the holes at the bottom of the feed-box, over which it is made to flide backwards and forwards in a groove. In this fliding motion it paffes under{tiff brufhes, which are placed. over it on each end of the holes, at the bot- tom of the feed-box, and ftrickle off the grain as the holes in the fliding bar pafs under them, by which the quantity of feed is meafured out with a confiderable. de-

* Phytplogia, p. 608,