. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 20.—Developmt ni of Cleavage by direct Pressure. Thus it appears to me that Professor Tyndall's brilliant experiment has been misinterpreted. He produced slaty cleavage not by a pressure uniformly distributed and vertical to the cleavage planes, hut by a sys- tem of forces inclined to the cleavage planes. The effect of rolling metal, clay, or pastry is similar to that of direct pressure combined with lateral friction. A cake of plastic material is reduced to a sheet with bulging edges like figure 20, c,
. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 20.—Developmt ni of Cleavage by direct Pressure. Thus it appears to me that Professor Tyndall's brilliant experiment has been misinterpreted. He produced slaty cleavage not by a pressure uniformly distributed and vertical to the cleavage planes, hut by a sys- tem of forces inclined to the cleavage planes. The effect of rolling metal, clay, or pastry is similar to that of direct pressure combined with lateral friction. A cake of plastic material is reduced to a sheet with bulging edges like figure 20, c, and an infinitesi- mal cubical portion of the mass is distorted as in the other cases. I am aware of no other ways in which slaty cleavage has been pro- duced artificially. In all of those discussed the distortion attending development of the cleavage is substantially the same. The elementary cube is deformed as it would be by a force inclined to one face of the cube when the opposite face rests upon an inflexible support. In some cases there is lateral constraint; in others there is none. The splinters on rolled metal and pastry seem to show that the cleavage developed is not quite parallel to the surface of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York, etc. ] The Society
Size: 1493px × 1673px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorge, booksubjectgeology, booksubjectgeologyunitedstates
