Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 209
am pressure. In another mercury seal system, air-valves are omitted and retarders—so called—are placed at thereturn ends of radiators. With a tight job of piping when the air in the system has oncebeen got rid of, the plant may be runfor some time—or until air leaks inagain—at a pressure less than…
Architecture · Building · Carpentry
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