George Fleming, Horse shoes and horse shoeing: their origin… (1869)
“ It will be seen that this question of weight at the lower end of the limb is a serious one; the power moving it acting at the upper extremities, and having but short leverage. We can readily imagine what a difference in power must be required to move a pound at the fore-arm or knee, and at the lower surface of the foot, and how much the lightening of a shoe by one or two ounces must affect the motion of the limb. ”
