Architect and engineer . PERIODIC FLUSHSYSTEMS. Thoroughly modern, yet based on nearly half acentury of experience in design, manufacture, and in-stallation, Johnson apparatus is available for a variety ofapplications. It plays an important part in the modern-ization of the mechanical plant in any type of control ROOM TEMPERATURES,7o/j«io« thermostatsoperate simple, rugged radiator valves or mixing dam-pers. Room thermostats may be had in the single tem-perature pattern or with the v^ell-knowa Johnson Dualarrangement, providing a reduced, economy temperaturewhen certain sections of
Architect and engineer . PERIODIC FLUSHSYSTEMS. Thoroughly modern, yet based on nearly half acentury of experience in design, manufacture, and in-stallation, Johnson apparatus is available for a variety ofapplications. It plays an important part in the modern-ization of the mechanical plant in any type of control ROOM TEMPERATURES,7o/j«io« thermostatsoperate simple, rugged radiator valves or mixing dam-pers. Room thermostats may be had in the single tem-perature pattern or with the v^ell-knowa Johnson Dualarrangement, providing a reduced, economy temperaturewhen certain sections of the building are unoccupied. . .For VENTILATION AND AIR CONDITIONING plants,there are thermostats, humidostats, and switches to con-trol valves and dampers, start and stop motors on tem-perature and humidity variation. Heating, cooling,humidifying, dehumidifying—whatever the problem,Johnson equipment is the answer . . JOHNSON ZONE CONTROL has been developed to a finepoint. Groups of radiators are controlled by the JohnsonDuo-Stat in a
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