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.
The principal closet and toilet-rooms are located in the front part of the building on the tenth floor as shown in the plan, Fig. 5. Figure 6 is a perspective sketch from P, Fig. 5. The principal feature of the plumbing-work here is that the pipes are arranged in a special chamber between the rows of closets, and while shut off from the public are located conveniently for the original construction or for subsequent work and cleaning, and are exposed and accessible, besides being directly and systematically arranged. The main soil and vent pipes are of cast iron, and all connections are with lead branches soldered to brass ferrules. Figure 7 is a diagram of the pipe lines, omitting the ventilating pipe or duct. and showing the trap vent pipe a little displaced to separate it from the soil pipe, which is really exactly beneath it. Figure 8 is a vertical transverse section through the pipe chamber at V V, Fig. 7. Figure 9 is a corresponding longitudinal section at S S. Figure 10 is a plan and section at Q Q. Figure 11 is a section at R R to show the connection of the trap vent and soil-pipe connections from the pairs of closets. Figure 12 is a section at Z Z to show the pipe frames supporting the main trap vent pipe V. Figure 13 is an elevation diagram from V V showing the arrangement of urinal pipes on the back of the marble slab N, Fig. 5. The cistern is set to flush automatically every 15 minutes during the daytime, and the pipes are dimensioned so as to give equal supply to each of the urinals. Figure 14 is a plan of the ventilation duct for exhausting the foul air.