. Rudimentary treatise on agricultural engineering . A smaller implement, called a subsoil harrow, is also manu-factured by Colman, for stirring the subsoil; it has twotines, united by the framework above, and a connecting-barat the bottom, upon the end of which is placed a kind ofshare, the depth being regulated by a lever similar to thelarge drag. Johnsons skim cultivator. This is the invention of the Johnson, of Grovelye,Linfield, Sussex, and is manufactured by Messrs. is for the purpose of breaking up and pulverising land,clearing it of weeds, rubbish, and of couch gras
. Rudimentary treatise on agricultural engineering . A smaller implement, called a subsoil harrow, is also manu-factured by Colman, for stirring the subsoil; it has twotines, united by the framework above, and a connecting-barat the bottom, upon the end of which is placed a kind ofshare, the depth being regulated by a lever similar to thelarge drag. Johnsons skim cultivator. This is the invention of the Johnson, of Grovelye,Linfield, Sussex, and is manufactured by Messrs. is for the purpose of breaking up and pulverising land,clearing it of weeds, rubbish, and of couch grass, and it isasserted, at a less expense than by the means usually resortedto. It is said that a lad with three horses may go over fiveacres per day ; and as the implement, from its simple form, 66 ROLLERS. is not so likely to choke up as most similar implements are,or require to be taken out of the ground so often, it is quitepossible this may be the case. It is found greatly to facili- Fig. tate the working of land during, and immediately after,harvest, for the purpose of bringing it into a proper state oftilth for the early root-crops in the spring of the year, andalso for cleaning bean and pea stubbles, tare lands, &c, inpreparation for coleworts, mustard, rape, and turnips, forearly autumn feeding, and leave the land in a good state forthe wheat crop. ROLLERS. The operation of rolling land is to effect several differentobjects, the principal of which are, the breaking the largelumps of earth that have been sun-dried, and to assist in thepreparation of a finer tilth, or pressing in the ground aboutnewly-sown seed, and to compress and smooth the surface ofgrass land, and render it better adapted for mowing. Theroller is a modern implement, as it would not be required inthe cultivation of such lands as were cropped in earnertimes. ROLLERS. 67 Eollers are made of wood, stone, and iron. The oldimplement was a rude affair, constructed on the farm withthe best materials
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