materiallv increasingtheir efficiency by the introduction of the Dunham RadiatorTrap at each radiator, insuring a positive circulation withoutloss of steam, and permitting the removal of all sputtering,leaking air valves which are such trouble-makers in these oldheating jobs. During these days when… … FJTjXjtsV^^ Detail No. 6.—Showing typical boiler Connections for DunhamReturn System, using Dunham Return Trap c« •*. 1 -•*- S v tin Dunham Return System using Dunham Inlet \alves connected at top of hot water tvpcradiators and Dunham Radiator Traps at return end of radi-ators and Dunham Return…
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