. Elements of practical agriculture; comprehending the cultivation of plants, the husbandry of the domestic animals, and the economy of the farm. THE ROLLER. KM manner in which the frame surmounts the cylinder, on the pi- vots of which it rests, will appear in the following figure. Fig. The length of the cylinder of the roller may be 5 feet, and its diameter 24 inches. The substitution of cast-iron for wood is a great improvement in the construction of this machine, on account of the superior durability of the material, and be- cause the iron surface is less apt than the wood to collect m
. Elements of practical agriculture; comprehending the cultivation of plants, the husbandry of the domestic animals, and the economy of the farm. THE ROLLER. KM manner in which the frame surmounts the cylinder, on the pi- vots of which it rests, will appear in the following figure. Fig. The length of the cylinder of the roller may be 5 feet, and its diameter 24 inches. The substitution of cast-iron for wood is a great improvement in the construction of this machine, on account of the superior durability of the material, and be- cause the iron surface is less apt than the wood to collect mud as it moves along. Frequently, instead of one long roller, the cylinder is divided into two, as shown in the figure, so that each part may revolve separately. The object of this is to diminish the labour of the cattle in turning. Sometimes upon the frame is fixed a large box, in which are put stones to increase the weight. The weight of the roller, however, will best be increased by adding to that of the cylinder; for the adding to the weight of the frame increases the friction in the way in which it is most con- siderable in the machine, namely, by the pressure of the sur- mounting frame upon the pivots. For the same reason, it is an error to render the frame too heavy, the weight being al- ways better increased by an addition to the weight of the cy- linder, than to that of the frame. For the constructing of this machine, it is important to know wheth er the cylinder of large or small diameter be the most < f ficacious. Contrary to the opinion very generally entertained by tli^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Low, David, 1786-1859. London : Longman, [etc. , etc. ]
Size: 2084px × 1199px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1830, bookleafnumber121, bookyear1838
