. Rudimentary treatise on agricultural engineering . who follows can, by simplymoving a lever, put it in or out of action without stoppingthe progress of the machine. An improvement has been also made by having twocoulter bars, by which arrangement the weights upon theends of the levers have exactly the same pressure uponevery coulter, thereby depositing the seed at an uniformdepth. Messrs. Hornsby, like Messrs. Garrett, manufacture everyother description of drill, adapted to large or small farms,for the various kinds of seed and methods of sowing. Fig. 23represents the Two-row Ridge Drill by
. Rudimentary treatise on agricultural engineering . who follows can, by simplymoving a lever, put it in or out of action without stoppingthe progress of the machine. An improvement has been also made by having twocoulter bars, by which arrangement the weights upon theends of the levers have exactly the same pressure uponevery coulter, thereby depositing the seed at an uniformdepth. Messrs. Hornsby, like Messrs. Garrett, manufacture everyother description of drill, adapted to large or small farms,for the various kinds of seed and methods of sowing. Fig. 23represents the Two-row Ridge Drill by this firm, whichreceived a prize at the Great Exhibition of 1S51. It hasadapted to it various improvements for regularly deliveringboth seed and manure, the same as in the general-purposedrill; and equal facility is afforded for altering the quantityof manure it is depositing as it travels forward. The manurecoulters are placed before the concave rollers; the ridges hensmans drill. 95 are then brought into the proper form, and the seed is Fig. deposited and followed by the second rollers, leavingthe ridges perfect. DENSMAK S DRILL. This is often called the Bedfordshire drill; it was origi-nally invented by Robert Salmon, of Woburn, but has beenmuch improved by other parties since—first by two brothersnamed Bachelor, machinists, residing at Lidlington, nearBedford, and by Smith, of Kempston, but more particularlyby Mr. Hensman. It is an efficient little implement, but is not adapted tothe variety of purposes that the other kind of drills are. 96 horxse-ys drill lor sjiall occupiers. A modification of this is constructed by William Hensman& Son, of VVoburn, who received a silver medal for it atthe York meeting, in 1848, and a prize medal at the GreatExhibition. This machine has several peculiarities, in which it differsmaterially from the generality of other drills. First, thatthe carnage rests upon the coulters instead of the coultershanging from the carriage: the coulter
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