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2012-10-24  grinding-machine was contrived, and experiments were made with three 151-inch glass disks, as well as with some smaller ones. Three mirrors of the same focal length and aperture, Dr. Draper says, are almost essential in working, for it not infrequently happens that two in succession will be so similar that a third is required for at-

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One large item we have is a mirror grinding machine. It is a Draper style machine. It was built by Allan Mackintosh. You may recognize the name. Allan was the author of the well known "Advanced Telescope Making Techniques" books still in print today from Willmann-Bell. Allan was also the Observatory Engineer for Indiana University for about 10

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2006-10-3  The eccentric that controls the side to side motion turns at 11 RPM. I can adjust the length of the stroke and the side to side motion as well as the position of the mirror on the tool. Now I know why my machine is so slow to do its work. I really like the way the mirror o matic works. I may have to rethink things a bit. Mark

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2013-2-2  A production of the famous ex-East-German firm, this machine looks very much like the off-set Draper-type machine (see figure G). It too has two eccentric sheaves but each arm (1 and 2) is directly connected to the drive pin of the lap, creating strokes that are slightly different from the other machine. One of these arms (1) is usually adjustable.

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2013-2-2  For this, he used a polishing machine which he described as early as 1841, for the benefit of the Royal Society. Later on, still another amateur, a rich merchant, William Lassell (1799-1880), used a polishing machine for the creation of large-sized mirrors (notably a 122cm mirror that was set up in

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henery draper mirror grinding machine . draper moved thither with his family henry being he began the construction of a rosse machine for grinding smaller mirror Get Price draper ocr mirror lens optics henry draper the action of machines for grinding and polishing has been more than sufficient to polish a 15i inch mirror is obtained this machine Get Price knife grinding

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henery draper mirror grinding machine. used mirror grinder machine in pakistan mirror grinding machine i made my first mirror grinding and polishing machine over thirty years ago it used the working principle of the machine . Get Price; Mirror Grinder Wholesale Mirror SuppliersAlibaba. Alibaba offers 1 624 mirror grinder products.

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Cement Mill Test Report Central Plains Cement. Central Plains Cement Co. LLC Tulsa Plant 2609 North 145th East Ave _____ Tulsa, OK 74012 918-437-3902 CHEMICAL ANALYSIS PHYSICAL ANALYSIS Month of Issue: Todd Hinton December 14, 2020 December 2020 October 2020 Cement Mill Test Report ASTM C 150-12 and AASHTO M 85-12 Standard Requirements

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