. Rudimentary treatise on agricultural engineering . ture, orpigeon-hole. These act upon small racks in the manner ofsluices, and regulate the supply with ease, certainty, andaccuracy. 4thly. In the introduction of vulcanised India-rubbertubes, instead of a succession of conical tins, for conveyingthe seed from the delivery box to the ground. These tubesare said to be much superior to the tins when drilling inwindy and rainy weather. The use of flexible tubes is not new, as leather tubes havefrequently been tried, but were found to wear out toorapidly. Mr. Hornsbys improvement consists in the
. Rudimentary treatise on agricultural engineering . ture, orpigeon-hole. These act upon small racks in the manner ofsluices, and regulate the supply with ease, certainty, andaccuracy. 4thly. In the introduction of vulcanised India-rubbertubes, instead of a succession of conical tins, for conveyingthe seed from the delivery box to the ground. These tubesare said to be much superior to the tins when drilling inwindy and rainy weather. The use of flexible tubes is not new, as leather tubes havefrequently been tried, but were found to wear out toorapidly. Mr. Hornsbys improvement consists in the appli-cation of vulcanised Indian-rubber for this purpose. garretts general-purpose drill. Tig. 22 represents the general-purpose drill of , and it is considered one of the very best drillsmanufactured, Messrs. Garrett having bestowed great pains LIBRARYUNIVERSITY IllOOinninni 92 Garretts general purpose drill. in perfecting this implement by adding every improvementthat practice could suggest for rendering it more effective. Fig. It is adapted for performing all the various operations ofseeding and manuring the land. All kinds of grain andseeds may be deposited at any required distances apart, andat any depth, either with or without compost or artificialmanures. They are constructed of various widths, and made todeposit the seed in rows from six to fifteen in number, andto suit all descriptions of land, whether ploughed flat orin ridges. The corn and manure are sometimes sown throughthe same delivery tubes, but it is better when double tubesand coulters are adopted, as the seed is then buried two orthree inches deeper than the seed (as before described), anda portion of mould placed between the two. The boxes aresuspended on a centre in the middle of the machine, andmay be elevated or depressed, at either end, by means of alever, so as to keep them at all times in a horizontal position, AN ECONOMICAL THREE-HOW DEILL. 93 and to insure a regular delivery of bo
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