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Pencil points to the sapphire cylinder polished on the waxed-in side. The cylindrical fixture accurately positions the sapphire true to its axis. The empty fixture on the right shows the recess.
The correct overall height is obtained by grinding on a Blanchard with a diamond wheel. The assembly is held vertically in a v-block.
A concave hemisphere is generated by a small diamond-plated cylinder tilted at the correct angle. The pencil points to this diamond tool; speed of tool 20,000 rpm.
The hemisphere is polished using a ball bearing as a lap and a ¼-
Interferogram showing creditable accuracy of the concave surface.