Ventilating Apparatus.

Patent for a new and improved ventilator. This design consists in "a fan casing, constructed and arranged . . . of the fan arranged therein, the gearing placed above the fan, the air-ducts leading to the fan-chamber, the endless weighted chain or cord, and drums and pulleys . . . [and] an open bottom secured to a ceiling and communicating with air-ducts passing between the floor and ceiling of a building" (lines 80-90)