Auguste Fernbach (1860-1939), a biologist working at the Pasteur Institute in Paris, found that a current of air favored the growth of the diptheria bacillus. The Fernbach flask was designed to take advantage of that observation. This example was probably made in Bohemia, and imported into the United States by the Henry Heil Chemical Co.
Ref: Henry Heil Chemical Co., Illustrated Catalogue and Price-List of Chemical Apparatus (St. Louis, 1903), p. 232.