Today in 1953, US Patent 2630311 A was issued, an invention of Verlin A. Bloxham, for his “Apparatus For Drying Hops.” There’s no Abstract, but in the description it states that the “invention relates to an apparatus for drying hops. The apparatus commonly employed heretofore for drying hops includes a house-like structure having a reticulated floor upon which the hops are loaded. This floor may be some 20 feet above the ground. Beneath the floor is disposed a heater burning fuel of one sort or another. The products of combustion from the heater usually pass through a zig-Zag or similar arrangement of pipes. located perhaps 8 feet beneath the floor on the way to the chimney. Forced draft of air is not provided, but the house is built tall enough, compared to its section, to provide a stack effect.”