On motion proportional to the driving power
A crossbow experiment to find the rule of range for balls and weights
Headed with a study of motion proportional to its driving power, this note sets out an experimental programme. Leonardo proposes using a crossbow, or another power that does not weaken, to launch balls of identical shape but different materials and weights, recording which travels farthest, then repeating with varied shapes, sizes, widths and lengths so as to derive a general rule. The converse question asks what weight the power will hurl a one-pound spherical weight the farthest.
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An experiment: one shape, different materials, weights and shapes
With balls of the same shape but different materials and weights, verify which goes the greatest distance from its motor; then test different shapes of varying sizes, widths and lengths, and make the rule general. The converse asks what weight the power will hurl a one-pound spherical weight the farthest from itself.
Using a crossbow as a constant, non-weakening power
Leonardo specifies that the experiment ought to be done with a crossbow, or another power that does not weaken over the course of the trials. A steady launching power lets the effect of the projectiles alone be compared.