US Patent 1,541,104, granted June 9, 1925 to John Frederick Briggs and Wilfred Yorke of Spondon, near Derby, England, assignors to the American Cellulose and Chemical Manufacturing Company. It describes dry (evaporative) spinning apparatus for artificial silk made from cellulose acetate and other cellulose derivatives. The apparatus is divided into spinning cells, each with its own outlet pipe, flow meter (water gauge) and regulating valve for the vapour-laden air, plus independent temperature control and air dehumidifying and preheating equipment. The patent has three sheets of drawings (Figs. 1-5), a specification and 13 claims.