ClipArt ETC
"This will be understood, when we consider that the reaction of b is just equal to the action of a, and that each of the other balls, in lke manner, ac, and react, o n the other, until the motion of a arrives at f, which, having no impediment, or nothing to act upon, is itself ut in motion." -Comstock 1850

Action and Reaction

"This will be understood, when we consider that the reaction of b is just equal to the action of a,…

"Two cannon balls, when suspened by long cords, so as to hang quite near each other, are found to exert a mutual attaction, so that neither of the cords are excatly perpendicular, but they approach each other..." -Comstock 1850

Gravitational Attraction

"Two cannon balls, when suspened by long cords, so as to hang quite near each other, are found to exert…

Any round body, or one nearly so.

Ball

Any round body, or one nearly so.

Ball of a flowerless and seedless vascular plant.

Fern Balls

Ball of a flowerless and seedless vascular plant.