Excerpt from The Annals of Hygiene, Vol. 2: The Official Organ of the State Board of Health of Pennsylvania; January-December, 1887
I have been asked many times the question why the Romans have spent such an amount of time, labor and money in building these prodigious channels across mountains and valleys, tunnelling the former and bridging over the latter with tunnels and bridges many miles long; when it would have been so easy and so economical to lay down pipes, following at a moderate depth the undulations of the country.
In other words, I have been asked whether the Romans have known or not the use of syphons. To be sure they knew it, in theory and in practice.
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