Today in 1908, US Patent 890031 A was issued, an invention of John F. Dornfeld, for his “Malting Kiln.” There’s no Abstract, though it’s described this way in the application:
I have invented certain new and useful Improvements in Malting-Kilns, of which the following is a specification.
Malting kilns as heretofore constructed comprise buildings of considerable height, in the upper part of which are arranged the malting floor or floors, and in the lower part are introduced the hot gases and. products of combustion from a furnace, together with a quantity of fresh air. No means is provided for mixing the hot and the cold air to produce a uniform temperature throughout the kiln and asa consequence the hot air rises in columns through the cooler surrounding air reaching the top of the kiln and there escaping through the ventilator at a temperature considerably in 4excess of the cool fresh air remaining in the bottom of the kiln.
One of the objects of this invention is to obviate the difficulty mentioned by mixing by mechanical means, the hot air and gases with cool fresh air, making a uniform mixture and introducing said mixture into the Further objects of the invention are to reduce the height of the kiln building, which reduction is rendered possible by locating the furnace outside of the kiln proper, and in other ways to improve the construction of such kiln.