Patent for a new and improved ventilator for grain, etc. This design consists in "[t]he combination, with the tubes, of the protecting end caps, consisting of a base-plate, by which it may be secured to the structure, and provided with a central opening, in which the ends of the tubes are adjusted, and a semi-cone . . . [also] [t]he combination, with the structure provided, with transverse ventilating-tubes projecting on the outside of the structure, of the . . . protecting caps" (lines 88-97).