Keywords: US591909A Argall rotary furnace longitudinal view patent.png fr Vue d'ensemble du four breveté par Philip Argall de type multitubulaire pour le grillage de minerais broyés Assemblage des deux demi-plans illustrant le brevet déposé le 19 oct 1897 en Overview of the kiln patented by Philip Argall which is a multi-tubular one designed to roast grinded ores Image done by a collation of two half-views illustrating the patent dated 19 oct 1897 1897 http //www google com na/patents/US591909 Patent US 591909A Philip Henry Argall 1854 - 1922 other versions PD-old-70-1923 Roasting kilns rotary kilns 1897 patents |