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Scientific American, Vol. 44, No. 9 (1881) (1881)
leaf 3
h the surface is finished makes a light roof, value of the different varicties. sible and valuable processes, extending back to its original which is not only air and water tight, but an effective non- Prior to 1868 Mr. Johns had been for several years prose- adaptation to such uses, and covering… … the magnitude of this branch of the business. one which has proved of great value to the The manner of grinding and mixing is differ- public, and for which there yet appears to be © 1881 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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