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Of the right foundation and

understanding of the balance and weight, upon which the acute
invention of all artificial instruments and machinations
is founded, and may be sought according to the right natural and geometrical foundation, whereby nature in many forms is artificially surpassed.

The first definition or explanation of the unusual words
that are used in this art of the right understanding of balance and weight.

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We set as the first: that such bodies or bodily things are of equal size when one encompasses as much space or room as the other. To prove such by an example, let there be two corpora sphaerica spherical bodies or round balls that are cast into one form or model; therefore I say that they are of equal size, even if they were not of the same material, such as one of lead, the other of iron or stone. Also, what is said of these two balls shall also be understood of every distinction, many-fold shape, and form.