
IN THE APRIL number, Dave Broadhead, Wellsville, N. Y., a leading member of the war-time Amateur Roof Prism Gang, described his "moist" technique of mirror figuring and in June told how he made a pair of matched 36" mirrors. July his modified Draper machine as described, and this month he gives compact working instructions for operating such machines with subdiameter tools. Except for fragments in Ritchey's classic book now out of print and rare, and a valuable paragraph by Ferson in "A.T.M.A.," page 84, (printings since June) nothing has been available to give the owner of a Draper machine his start in life. What follows will therefore be valuable. By Broadhead:
Nearly all machines used in precision optics are basically related to the Draper, with the following characteristic adjustments:
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