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Lab Techniques


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THE AVERAGE amateur telescope maker finds the common Newtonian type of instrument satisfactory but, as a number wanted to make Cassegrainian telescopes Russell W. Porter accordingly wrote, for the instruction book "Amateur Telescope Making," a chapter entitled "How to Make a Cassegrainian." He state..
Rs.171.99
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IN THE following article Patrick A. Driscoll, Lima, N. Y., who went from "A.T.M." to a job as experimental lens maker in the Eastman Hawk-Eye Works in Rochester, tells how to furnish your wife with grounds for divorce for cruelty by casting metal lens or mirror grinding tools in the home kitchen, us..
Rs.171.99
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ON MARCH 9, BEGINNING 41 minutes after midnight Universal Time, a few hardy souls willing to brave the Siberian winter will witness a total eclipse of the sun. As the lunar shadow rushes northward across the subzero landscape, intrepid observers will see, in addition to the usual spectacular solar c..
Rs.171.99
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CERIUM OXIDE and its relative, Barnesite, are now largely doing the work formerly done by rouge in the precision optical industry, though it is not likely that rouge will ever be abandoned. The new materials are used mainly like rouge but there are some minor differences in working technique. One re..
Rs.171.99
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ABOUT A YEAR ago in this department we referred to the risk of explosion of the silvering solution used in silvering the mirrors of reflecting telescopes, and requested any who had heard of such explosions to advise us. Although several thousands of our readers have silvered mirrors-many of them a n..
Rs.171.99
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IN 1913 WILLIAM BROOKS CABOT AND Russell W. Porter together explored the St. Augustine River in Labrador, east of the route up which a railroad is now being pushed toward the great new iron-ore deposits. In later years they discussed the question whether an explorer could determine his latitude in t..
Rs.171.99
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ABOUT A YEAR AGO a number of 16-inch Pyrex glass blanks were offered to the readers of this magazine at a fraction of the market price. Within a short time the last of more than 400 blanks had been sold, two thirds of them to amateur telescope makers throughout the nation. One might assume that each..
Rs.171.99
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THEY SAY THAT "even your best friend won't tell you" about halitosis-or is it "B. O."?-but somebody recently told us we had been publishing "too many descriptions of telescopes and not enough sauce. "All right then, we shall temporarily sidetrack 32 telescope descriptions now on hand and not yet pub..
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THE REASON why an amateur telescope maker is willing to spend many hours polishing a concave mirror, enjoying what must appear to others a tedious task, can now be explained to the non-telescope maker with the aid of the unique series of "focograms" shown at the left. These photographs span the poli..
Rs.171.99
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NOW AND THEN THIS DEPARTMENT LEARNS of a telescope mirror which, while its performance on the stars apparently is not affected, exhibits under the knife-edge the entire outline of the lap on which it was cold pressed. George A. Kennedy, mining engineer, of Denver, before he died, described a mirror ..
Rs.171.99
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YEARS AGO John C. Lee devised and made a grinding and polishing machine (see "A.T.M.," page 160) in which the telescope mirror moved in a bath of liquid abrasive. He could start it running, go to bed, and get up to find the part of the roughing-out job finished. Now comes O. Magnussen, 514 Ricketts ..
Rs.171.99
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MACHINES FOR grinding and polishing the concave mirror disks which form the most important part of the reflecting type of telescope are not a necessity, as has been explained in the book "Amateur Telescope Making," and perhaps 95 percent of the mirrors made are done by hand, but it is fun to make a ..
Rs.171.99
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