This section is from the book "American Plumbing Practice", by The Engineering Record. Also available from Amazon: Plumbing: A working manual of American plumbing practice.
(Published In 1889.)
E. H. Kendall, architect, of New York City, has called our attention to the ingenious arrangement which he recently discovered, whereby the plumber of a country residence contrived to admit cesspool gas where it was most necessary to exclude it.
A BY-PASS FROM CESSPOOL.
A is the house drain, F the main trap cut-off drain from cesspool. C is a fresh-air pipe from inlet D. To ventilate the cesspool the plumber conceived the idea of extending the inlet pipe to E, where he connected it with the drain pipe and thus provided for the free escape of cesspool gas under the windows, and past the main trap F, as indicated by the arrows, thus making his main trap useless.