Mechanical Contracting & Plumbing January-December 1909 . -mittee of the association, which met onFriday, July 2nd, was the fire-escapecontest. This promises to be of espec^14 ver trophy, now resting under the wingof the Toronto association. During the afternoon there will be ameeting which will be addressed by anumber of the leading public men ofthe day. As the programme is a particularlygood one the energies of those in chargewill be directed to making the Commer-cial Travelers Day of 1909 better thanthe best of the past, July 15, 1909. PLUMBER AND STEAMFITTER Plumbing Systems for Schools an
Mechanical Contracting & Plumbing January-December 1909 . -mittee of the association, which met onFriday, July 2nd, was the fire-escapecontest. This promises to be of espec^14 ver trophy, now resting under the wingof the Toronto association. During the afternoon there will be ameeting which will be addressed by anumber of the leading public men ofthe day. As the programme is a particularlygood one the energies of those in chargewill be directed to making the Commer-cial Travelers Day of 1909 better thanthe best of the past, July 15, 1909. PLUMBER AND STEAMFITTER Plumbing Systems for Schools and Hospitals By Frank Dumond, Plumbing Inspector, Rochester, N. Y. This subject is far-reaching—there areso many architectural and other condi-tions to be considered. After so muchhas been said along the lines of plumb-ing for buildings of this class I hardlyfeel equal to the task, but, however,will endeavor to create some little dis-cussion by giving my idea on the sub-ject. I consider the best modern method ofobtaining ventilation in a system of soil. Modern Yoke or Circuil VentilationSystem. and waslc pipes I be installed in pub-lic buildings, whore fixtures are placedin groups, is the yoke or circuit ven-tilation system, by means of which sy-phonage and back pressure on seals oftraps are prevented by instating twolines of pipe fixtures being placed be-tween two such lines. Substantial floorconnections should be made with thread-ed brass nibbles -caulked info soil pipefittings and provided with brass floorflanges. My reason for preferring the yoke orcircuit ventilation to back ventilationis that in the former system the leadbend, which so often gives out, is dis- pensed with and the whole system isprovided with free ventilation unchok-ed, the full size of the soil and wastepipe. This, in my opinion, is much bet-ter than the 2-inch back vent connect-ed to 4-inch lead bends, which has atendency to hold the lead bend rigidand prevent in a measure the expansionand contraction,
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