642 Report on the Trials of Implements at Bedford. 



No, 1571. C Dening and Co., of Chard, Somerset. — By referring to the 

 annexed woodcut (Fig. 7), this drill will be seen to consist of a seed-box, a, 

 in which is placed a slide, b, acted on by a rack pinion for regulating the 

 quantity to be sown. The seed is drawn from the seed-box by an endless 

 chain, c, passing over its floor. This chain c passes round two revolving 

 pulleys ; the spindle of the front pulley D being fixed, while that of the hind 

 pulley rests in a shifting bearing, e, acted on by a thumb-screw, F, for 

 tightening the chain, or for throwing it out of gear by slackening it. This 

 chain delivers the seed into the chain-cups g, and thus through the coulter h, 



Fig. 7. — Section of Messrs. C Dening and Co.'s Chain Corn-Drill, 

 No. 1571, sliowing Patent Lift and Cross-bar. 



which has a movable shoe, i, which may be replaced at a small cost when worn 

 out. The coulter levers are raised and pressed by chains passing over and 

 fixed to a pulley, n ; this is turned by means of the handle K, which catches 

 into notches on the pulley by means of a spring attached to it. A cam, m, 

 is also attached to the pulley, by means of which, in raising the end of the 

 lever l, simultaneously with the raising of the coulters, the seed-box is 

 thrown out of gear. This is an ingenious invention, and is likely to prove 

 the thing that is wanted for steam drilling ; for in Class II., where this drill was 

 also entered, it was drawn over the field at a gallop, and instead of the seed 

 delivery being increased by this quick speed, it was slightly diminished. The 

 respective weights of grain delivered by the chains in ounces were 22, 22, 

 22, 19i, 21i : while in Class II., in the first run at a slow pace, they were 

 17i, 17i, m, 16, 16^ ; and in the run at a gallop 15, 15, 15, 13, 13|. 



