Excerpt from The Manufacture of Photogenic or Hydro-Carbon Oils, From Coal and Other Bituminous Capable of Supplying Burning Fluids
The present little treatise is the first published monograph on the art of distilling oils from minerals containing Bitumen: like the art itself, it is necessarily imperfect in some particulars. The difficulty of obtaining detailed information on methods of manufacture abroad or at home, is not inconsiderable, when the history and progress of an art has to be newly described.
The position which the Author occupies in the U.S. Patent Office (having in charge the examination of a large class of patented applications, involving chemical processes), has enabled him to present to the public this record of the origin and condition of an infant art - the well-furnished Library of the Patent Office having furnished him the means to indicate the state of the manufacture abroad.
It is hoped it will be acceptably received by those occupied with, or interested in, this new branch of industry.
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