Baltimore: The Bartlett Hayward Co., (1923). First Printing. Hardcover. 8vo, publisher's cloth, very good, previous owner's name in pencil. 55 pp, illustrated, including 5 folding diagrams. The feld scrubber removed pollutants from gases produced in the production of potash and other fuels. Uncommon, with OCLC locating a single holding, Hagley.....