Bragg, William Henry, Sir, 1862-1942, Bragg, William Lawrence, Sir, 1890-1971 · London : G. Bell · leaf 177
. Quartz isthus referred to three equal axes making equalangles with each other, just as is calcite. Quartz, * See W. H. Bragg, Proc. Roy. Soc, A, Vol. 89, p. 575. … IiG. 53. ANALYSIS OF CRYSTALS 161 howev^er, unlike calcite, possesses neither planesnor centre of symmetry, having axes of symmetryalone. There is a single axis of three-fold sym-metry, with three axes of twofold symmetry inter-secting in it, these being shown in the figure.Because quartz has no…
Crystallography · X-rays
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-250-438.webp)
![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-34-47.webp)
