Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 189
148 HEATING AND VENTILATION 139 which would otherwise be wasted may be saved in this way. Theconnections will depend somewhat upon the form of heater used:but in general a single connection with the heating main inside theback-pressure valve is all that is necessary. The condensation fromthe heater… … HEATING AND VENTILATION PART III VACUUM SYSTEMS Low=Pressure or Vacuum Systems. In the systems of steamheating which have been described up to this point, the pressurecarried has always been above that of the atmosphere, and the actionof gravity has been depended upon to carry the water of…
Architecture · Building · Carpentry
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