. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Vol. XIII. Xo. 324. THE AGEICULTUE.\L XEWS. 315 STUDENTS' CORNER. DYNAMICS OF A ^ I'AKT 11. The ((uestion to Le considered is the position and direction to ii]jply the force to overronie these three several To do so it is necessary to reduce them to one single resistance, and to fi.\ approximately the position and direction of this. Under the laws of dynamics (force in motion) any number of forces or resistances (components) acting on a solid body and ditiering in magnitude and direc- t
. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. Vol. XIII. Xo. 324. THE AGEICULTUE.\L XEWS. 315 STUDENTS' CORNER. DYNAMICS OF A ^ I'AKT 11. The ((uestion to Le considered is the position and direction to ii]jply the force to overronie these three several To do so it is necessary to reduce them to one single resistance, and to fi.\ approximately the position and direction of this. Under the laws of dynamics (force in motion) any number of forces or resistances (components) acting on a solid body and ditiering in magnitude and direc- tion may be resolved into a single force or resistance, the position, magnitude, and direction of which are fixed by the magnitude and direction of of the several components. ir ,' Fic. 7. B= Force acting in echelon, parallel to beam. In Stephen's Book of Farm linijlements, jjulilishcd in , dealing with this subject, the point of resultant resis- tance—that is, the final resistance arrived at on combining the several resistances in operation—of a plough is called the 'centre of gravity'. As, however, gravity is not the principal cause of the resistance of a jilough, I prefer to call the point in question the 'resultant centre of resistance and point of balance'. By this is meant the imaginary point in the body of the plough from which a single force, acting horizontally to the said point and parallel to the land side, will overcome the resistance with a min- imum of loss. If the force Vie applied obliquely to the said point the direction of the plough will not be altered, but the Jilough will advance in eche] inches to the rear of the point of share 2 inches up from the base line of plough (which is a straight line from the point of share to tread of ba<-k wheel) and 3 inches to the right of the land side of the plough, looking from the rear of the plough. To ascertain the precise position is not essential to the argument. It should here be noted that this imaginary
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