It is not requisite to calculate throughout the effect of the Marquis's entire number of 40 weights; four will suffice, taking the vertical and horizontal spokes a a a a, showing two rings a and b; one, b, 12 inches within the other, so that the wheel being, as the Marquis says, 14 feet diameter, the inner ring will be 12 feet diameter. Now let each weight D be attached in the centre of a cord or chain a´, D, b´, 2 feet long, and then secure one end, as a´, so the extreme end of each spoke a´, and the other end of the cord, as b´, to place on one lesser ring, as at b, or 12 inches from each spoke.
We shall then find by admeasurement that the upper weight on the vertical spoke is 7 feet from the centre, and the lower weight 6 feet; while at the same time there appears to be a preponderance due to the superior length of the horizontal arm A´; but against this latter we have the rising weight b´D, 1 foot from the centre, which, added to the 6 feet on the horizontal spoke, neutralizes the hoped-for effect, and the wheel remains in statu quo.
THE END.
