Page:Frontinus - The stratagems, and, the aqueducts of Rome (Bennet et al 1925).djvu/429

 Thus by diminishing the size of the 20-pipe by which they constantly deliver, and enlarging the 100- and 120-pipes, by which they always receive, they steal in case of the 100-pipe 27 quinariae, and in case of the 120-pipe 86 quinariae. While this is proved by computation, it is also obvious from the facts. For from the 20-pipe, which Caesar rates at 16 quinariae, they do not deliver more than 13; and it is equally certain that from the 100-pipe and the 120-pipe, which they have expanded, they deliver only up to a limited amount, since Caesar, as his records show, has made delivery according to his grant, when out of each 100-pipe he furnishes $16 7⁄24$ quinariae, and similarly out of a 120-pipe, 98.

 In all there are 25 ajutages. They all conform to their computed and recorded capacities, barring these four which the water-men have altered. But everything embraced under the head of mensuration ought to be fixed, unchanged, and constant. For onlv so will any special computation accord with general principles. Just as a sextarius, for example, has a regular ratio to a cyathus, and 