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Making Thin Mirrors

Making Thin Mirrors

TWO MONTHS AGO in this space we described Broadhead's mirror grinding technique, last month the question of thin mirrors was discussed, and now the two are conjoined: Broadhead making a pair of thin mirrors.

Recently, Dr. John Strong, author of the widely used book "Procedures in Experimental Physics" and now professor of experimental physics at the Johns Hopkins University, asked this department whether some of the advanced amateur telescope makers could make, for non-astronomical research in the infra-red, a matched pair of 36" spherical mirrors of 1-1/4" plate glass (thickness-to-diameter ratio, 1:27), of focal length between 99' and 101' (f/33) and in focal length not more than 6" different from each other, with a circle of confusion (pinhole image) at center curvature not greater than 1/8" diameter in single reflections.

For full article (Science Fair Idea) buy PDF copy now!

Making Thin Mirrors
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