. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... direction falls pre-cisely where the wheels rest on the ground, but if theroad ascend or descend, it falls elsewhere; this ex-plains the reason why it will run by its own weightdown a slope. Whenever a stone or other obstruction occurs in aroad, it becomes requisite to raise the centre by theforce of the team and by means of oblique motion, soas to throw the wheel over it,as shown by F
. Farm implements, and the principles of their construction and use; an elementary and familiar treatise on mechanics, and on natural philosophy generally, as applied to the ordinary practices of agriculture ... direction falls pre-cisely where the wheels rest on the ground, but if theroad ascend or descend, it falls elsewhere; this ex-plains the reason why it will run by its own weightdown a slope. Whenever a stone or other obstruction occurs in aroad, it becomes requisite to raise the centre by theforce of the team and by means of oblique motion, soas to throw the wheel over it,as shown by Fig-. 29. Oneof the reasons thus becomesvery plain why a large wheelrig. 30. _ will run withmore ease ona rough roadthan a small-er one ; the larger one mounting any stone or obstruction withoutlifting the load so much out of a level or direct line, asshown by the dotted lines in the annexed figures ( and 30). Another reason is, the large wheel doesFig. 31. Fig. 32. not sink into the smaller cavities in the road. A self-supporting fruit-ladder (Figure 31) (thecentre of gravity, whenin use, being at or nearthe top) must have itsmA dal^rmcs- legs more widely spread,ladder.™1 to be secure from fall-.
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Keywords: ., bookcentury1800, bookdecade1850, bookpublishernewyo, bookyear1854
