Report of the Commissioner of Patents for the year .. (1849)
United States. Patent Office · Washington : Office of Printers to House of Reps. · leaf 131
125 COMMISSIOl^ER OF PATEiSTTS. … Fig. 1. increased quantity of air to supply the fan, whenever the fan demands more than conld be drawn tlie OT-ain, without increasins: the streno-th of the blast to such a degree as would endanger tlie carrying away of the sound grain with the impurities. Also in a self-regulating delivery valve,…
United States. Patent Office · Patents · Agriculture
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
