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Lab Techniques


AS EXPLAINED in Part V of the book "Amateur Telescope Making," which treats of automatic machines for those who prefer not to perform the customary hand work of making the concave mirror of a reflecting telescope, a machine is not a necessary adjunct to the telescope maker's shop: not one amateur ou..
Rs.171.99
IF THE FACETS of a pitch lap are arranged symmetrically, a mirror polished on it may show zones. All instructions for making pitch laps therefore specify that the center of the lap must fall in one corner of a facet. But even this method may produce zones, because the channels on either side of the ..
Rs.171.99
AVERAGING ONCE a year someone asks this department why telescope mirrors have to be so thick, and now comes an inquirer who reasons that if mirrors were thinner they would have just that much less weight to support and therefore wouldn't sag any more than thicker ones, also would adapt themselves to..
Rs.171.99
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HERE IS THE contribution of James T Barkelew, an engineer and patent attorney of Los Angeles (Great Republic Life Building), which we promised last month as a continuation of an article on photo-electric guiding of telescopes, written by Wilbur Silvertooth. It indicates how far he has progressed. Ot..
Rs.171.99
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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. P..
Rs.171.99
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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 comp..
Rs.171.99
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IN THE November number we published brief descriptions of five telescopes made by average beginners. This time our space is devoted to a description of a large instrument such as more experienced amateurs may expect to make as their second or third job. The description comes from A. V. Goddard, 282 ..
Rs.171.99
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GLASS IN several aspects pertinent to its use in telescoptics is the subject of this month's discussion, in the course of which we shall sweep up comments from several scientific journals not ordinarily seen by most readers.ALL is not optical glass that glisters, but on the other hand not all that i..
Rs.171.99
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LAST JUNE this department contained an account of what Russell Porter did to help win the war and showed a photograph of him lying on a sofa reading The Los Angeles Astonisher while his newly made polishing machine slaved directly beneath him in the cellar. The war over, he was enjoying a little wel..
Rs.171.99
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READERS OF THIS department and friends of Russell Porter-those who have seen him and those who hope to-have asked many times since World War II began what he was doing. Though your scribe has exchanged letters and notes, containing innumerable enclosures of a telescoptical nature, with Porter for 20..
Rs.171.99
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UNIQUELY, the richest-field telescope, or RFT, because of its special design, reveals in one view of splendor the greatest number of stars that can be made visible in any telescope, small or large, and the man who first worked it out, S. L. Walkden, of London, described its principles in ''Amateur T..
Rs.171.99
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ROSE TOOLS having petals which are tapered, in contradistinction to I tools similarly used for local correction of optical surfaces but which are simply channeled in the normal manner, turn out to have been the invention of the famous "Uncle John" Brashear. Mirror makers have used such tools for yea..
Rs.171.99
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