Structural geology . Fig. 4. Fracture of building stone (brown sandstone) along shearing planes. After Buckley. 18 STRUCTURAL GEOLOGY. Fig. Wire netting model undeformed. See also Figs. 6 and the use of the sphere as the unit of original structure and the strainellipsoid as its deformed equivalent. Fractures under compressiontend to follow the cross sections in the strain ellipsoid which are thesame in dimensions as those of the original sphere; in other words,planes (called planes of no distortion) determined by the intersec-tions of the original sphere with the strain ellipsoid. COMPRESSION
Structural geology . Fig. 4. Fracture of building stone (brown sandstone) along shearing planes. After Buckley. 18 STRUCTURAL GEOLOGY. Fig. Wire netting model undeformed. See also Figs. 6 and the use of the sphere as the unit of original structure and the strainellipsoid as its deformed equivalent. Fractures under compressiontend to follow the cross sections in the strain ellipsoid which are thesame in dimensions as those of the original sphere; in other words,planes (called planes of no distortion) determined by the intersec-tions of the original sphere with the strain ellipsoid. COMPRESSION FRACTURES 19 A simple device for illustrating the position of strain ellipsoidand shearing planes in both rotational and non-rotational strainis shown in Figs. 5, 6; and 7. A cardboard upon which is inscribeda circle is laid between two sheets of wire netting. The three arethen fastened together by a rivet in the center of the circle. Awooden hinged frame fastened to the netting allows and controlsthe distortion of the netting, while the interior sheet remains undis-
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1913
