Abstract
C. V. RAMAN describes in NATURE of October 9, 1919, percussion figures in isotropic solids. These figures are known in geology, and are found on rounded boulders of compact, homogeneous rocks, such as flint and quartzite. Albert Heim1 described in 1871 the “percussion-cones” (Schlagconus) brought forth artificially on pieces of flint by a powerful short blow with a hammer. F. Mühlberg,2 of Aarau (Switzerland) was perhaps the first geologist who described the percussion-figures (Schlagfiguren) on rounded boulders (1885). On some of the quartz-boulders from the River Aar, near Aarau, he found from hundreds to thousands of circular cracks, which he explained by the abrasion of boulders which formerly received coniform cracks through the numerous impacts during their transport through the river-bed.
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ESCHER, B. Percussion-Figures. Nature 105, 171 (1920). https://doi.org/10.1038/105171c0
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DOI: https://doi.org/10.1038/105171c0
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