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operation was the polishing. this time i had no trust in polishing with leather or felt, as a tiny lens like this with orange-peel surface will certainly not produce a sharp image. leather or
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, say : probably 99 per cent of our export production is made on english measurements and weights - - that is , inches , feet and pounds . the standard pressed steel company ( in e
turned on primitive lathes like those that were then being used to turn axles. the earliest clearly documented reference to lenses - burning glasses, in that case - occurred in the clouds
, astronomers also use telescopes that focus radio waves, x-rays, and other forms of electromagnetic radiation. telescopes vary in size and sophistication from homemade spyglasses
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in the seventeenth century. reproduced from manzini's l'occhiale all 'occhio (bologna, 1666). download full size ppt slide pdf. figure: fig. 4. fig. 4 improved lathe for grinding
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last day i actually have found a reproduction of the model you speak of, made for the 400th year anniversary of the telescope: would you mind if i use your description as a post in my
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technology, we can achieve high-precision results and adhere to the lowest tolerances at the same time. in addition to the conventional production of glass lenses, we currently rely on
of these are other optics instruments, 22 are fiber optic equipment, and 5 are grinding machines. a wide variety of optical grinding machine options are available to you, there
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appearance design . host and scanners are splited. 2.with the optical center and geometric center of the two operating modes; 3.the scanned data can be corrected, including axial
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