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More Ways to Work Larger Mirrors. Broadhead's Draper

More Ways to Work Larger Mirrors. Broadhead's Draper

NOW THAT 16" telescopes are being tackled by more and more amateurs, advice about ways to work large mirrors is being sought. A 16" may be worked by hand atop a full-size tool. Porter did this years ago and Wm. Buchele, Toledo, in 1939, worked a 100-pound 21" mirror that way but was very muscular. Plate glass tools are satisfactory against Pyrex. To fore-fend against sticking, no joke if on a 16", the tool should be channeled and the lap sub-faceted as described by Ferson in "A.T.M.A.," (printings since 1944, June), pages 101 and 99. Better than the full-size-tool, face-down method may be the sub-diameter hand tool, face-down method described in "A.T.M.A.," page 49. Not all have had happy results with this method; it is hard to confine strokes to desired zones and to apply even pressures. More experience letters that would help others are needed concerning it.

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More Ways to Work Larger Mirrors. Broadhead's Draper
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