
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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