This class relates only to automatic temperature and humidityregulation, and is not to include the system where the thermostaticcontrol constitutes but an element of the system, even though thesystem includes temperature regulation, such, for example, as refrigeration,where the refrigerating structure or method is claimed. Systemsare also excluded where the specific burner structure, specificboiler structure, specific heat-exchange element, specific fireextinguishing structure, specific heat distributing system, specificinternal-combustion engine structure, specific furnace structure,specific gas producer structure or method, specific heating andmolding devices, etc., are claimed--that is, this class is confinedto automatically operating temperature or humidity controlling mechanism,but excludes all patents to the specific mechanism controlled, eventhough the thermostat is claimed, either broadly or specifically, incombination therewith.
(1)Note. This class includes only patents for devices whichcontrol temperature or humidity automatically, but not those whichare merely operated by temperature variation. The only apparentexceptions are the heating radiator thermostatic air relief valves,the thermostatic steam traps and thermostatically operated regulatingvalves.
(2)Note. This class provides for all heating radiator automaticair relief valves including a thermostat.
(3)Note. This class provides for all automatic steam traps includinga thermostat in the combination.
(4)Note. Patents for devices for controlling the flow of airover an automobile radiator by means of a thermostat located eitherin the cooling water or under the hood are classified in this classunless some novelty in the engine or cooling system is claimed.