Diamonds and precious stones, a popular account of gems .. . Fig. 103.—Natural Octahedral Diamond. The starting point for the modern diamond, asfor the ancient Indian form, is the simple octa-. Fig. 104. Fig. 105. hedron. The following is the method employed informing the octahedron into a brilliant :— 26o PRECIOUS STONES. In Fig. 103 let the line AB which joins the twoopposite summits, be divided into six equal parts,and let a plane perpendicular to the line AB passthrough the second division from the upper point,and another plane also at right angles to AB passthrough the first division from
Diamonds and precious stones, a popular account of gems .. . Fig. 103.—Natural Octahedral Diamond. The starting point for the modern diamond, asfor the ancient Indian form, is the simple octa-. Fig. 104. Fig. 105. hedron. The following is the method employed informing the octahedron into a brilliant :— 26o PRECIOUS STONES. In Fig. 103 let the line AB which joins the twoopposite summits, be divided into six equal parts,and let a plane perpendicular to the line AB passthrough the second division from the upper point,and another plane also at right angles to AB passthrough the first division from the lower point,then a small pyramid will be detached from eachextremity, and there will remain the solid repre-sented by Fig. 104.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgems, booksubjectprec
