TUE

AGRICULTURAL MAGAZINE.

ND ACHE FEBRUARY 203...[Vor. VH.

ME ruyrme EEE

DR. DARWIN’s DRILL PLOUGEH, AND MR. SWANWICK's SEED BOX. (WITH A PLATE) Copied from Dr. Daræin’'s Phytologia, with permission.

(C'ONSTEUCTION of the carriage part. Fig. 1. aa are

the shafts for the horse, which are fixedto the centre of the axle tree by a simple universal joint z, whence, if the horse swerve from a straight line, or is purposely made to pass obliquély to avoid treading on the rows' of corn in hoeing, the person who guides the plough behind may keep the coulters of the plough or hee in any line he pleases, Which 1s thus performed with much simpler mechanism than that used in Mr. Cook's patent. plough tor the same pur- pose, which has mah joints, like a parallel rule. bb are the horns or shafts behind for the person who guides the drill, coulters, or hoes; they are fixed tothe axle-tree before, and have a cross piece about six inches from it at cd, for the purpose of supporting the seed box, described’ below. Behind this, about a foot distant from it, 18 another cross piece ät cc, called the coulter beam, which is fifty inches long, sìx inches wide, and two inches thick; it is perforated with two sets of square holes, sìx in each set, to receive the conulters in drill ploughing, and the hoes in horse hoeing. The six light square holes are nine inches from each other, and áre to receive the coulters or hoes in the cultivation of Wheat, the rows of which are designed to be nine inches from each other; and the six dark square holes are placed sevén inches from each other to receive the coulters or hoes for the cultivation of barley, the rows of which are designed to be but seven inches distant from each other. Besides these, there are sìx round holes through this coulter beam at one Part of it, and sïx iron circular staples fixed into the edge of the other part of it; these are to receive the ends of hé tin flues which cross each other, and convey the seed from the bottom of the seed box into the drills or furrows, when the eoulters are disposed in the square perforations before them. These coulters or hoes, the person who guides the machine can raise out of the ground in turning at the ends of the lands, or in Ppassing to or from the field, and can SuUspend them s0 raised on the iron springs dd, which, at the same

Aa. Mas. Fol. a. N

————