Radford's cyclopedia of construction; carpentry, building and architecture. Based on the practical experience of a large staff of experts in actual constrcution work (1909)
Johnson, Alfred Sidney, 1860-, Radford, William A., 1865- · Chicago Radford Architectural Co · leaf 155
Fig. 97. Mercury Seal Appli-ance Used in Trane VacuumHeating System. Fig. 98. Mercury Seal Appli-ance Used in K-M-C VacuumHeating System. … HEATING AND VENTILATION 129 pressure equal to or below that of the atmos-phere. The Trane system involves the use of a cupof mercury in the center of a device called amercury seal, as illustrated by Fig. 97. Aspecial form of automatic air-valve, ha^dng aunion drip connection, is used on the return…
Architecture · Building
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Current architecture: published in connection with a joint exibition [sic] held in Boston November 1916 (1916)](https://img.insideoutlibrary.com/img/200/ia-currentarchitect1916bost-124-183.webp)
