. The London, Edinburgh and Dublin philosophical magazine and journal of science. fi2, /a3 be taken proportional to the numbers 3 4> 6 The principal sections of ihe ellipsoid of elasticity are shown in figs. 1, 2, 3. In fig. 1 the full straight lines through the centre are the traces of diametral planes cutting the quadric in circular sections. These lines are inclined at an angle of 49° 51 to the positive and negative directions of the axis of so. The broken lines are the optic axes and are perpendicular to the circular sections. The semi-angle * Communicated by the Author. 118 The Propaga
. The London, Edinburgh and Dublin philosophical magazine and journal of science. fi2, /a3 be taken proportional to the numbers 3 4> 6 The principal sections of ihe ellipsoid of elasticity are shown in figs. 1, 2, 3. In fig. 1 the full straight lines through the centre are the traces of diametral planes cutting the quadric in circular sections. These lines are inclined at an angle of 49° 51 to the positive and negative directions of the axis of so. The broken lines are the optic axes and are perpendicular to the circular sections. The semi-angle * Communicated by the Author. 118 The Propagation of Light in Biaxals. between the optic axes is 49° 50and the radius of the circularsection is 4. Fte. There is no difficulty in making a cardboard model of theprincipal sections and Ihe circular sections of this ellipses can be drawn by the ordinary mechanical deviceor by elliptic trammels. If the latter are not available it willbe probably found more speedy and accurate to set out thecurves on squared paper from the following tables (p. 320). Fisr. 2.
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Keywords: ., bookcentury1800, bookdecade1840, bookidlondon, booksubjectscience
