Patent for a new and improved fire extinguisher. This design is "to provide for automatically putting out a fire in any building in which [the] apparatus may be located, upon the temperature in said building or room reaching any predetermined degree. This result is accomplished by the action of an expansible fluid—such as mercury—in a contained vessel, which actuates certain . . . mechanism, causing the structure to be flooded with water or with a fire-extinguishing gas or fluid" (lines 22-32).