Equal Arms by the Circle: an Equals ar
A balance argument where eight pounds weigh as four, the rest borne by the pivot
A continuation of the balance analysis: on an arm like a n, eight pounds weigh only as four, the remaining four being discharged over the pivot of the balance m a f. Invoking the definition of the circle, Leonardo argues that line a n equals line a r, so that the arms a n and a r are equal and therefore of equal power. The passage opens with the numeral 41.
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Eight pounds weigh as four; the rest goes to the pivot
On an arm such as a n, the eight pounds weigh only for four, so that the other four discharge themselves over the pivot of the balance m a f. The passage continues an argument begun on the facing figure.
By the definition of the circle, an equals ar
By the definition of the circle, line a n is equal to line a r, so the arm a n is equal to the arm a r. As a consequence, it is of equal power.