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Mirror Grinding Machines, Seismology?

Mirror Grinding Machines, Seismology?

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 out of a hundred uses one. Some, however, really enjoy designing and making a machine, and to such the illustrations reproduced in these columns may prove of interest.

F. Moore, 1021 Pemberton Road, Victoria, B. C., Canada, sends in three photographs, one showing two friends and himself with several interesting exhibits of machine work as added scenic features. Mr. Moore is rather short on words-all he writes is: "I enclose photos of a grinding machine I have constructed. On it an 11-inch speculum is being completed. The 2-1/2-inch achromatic object glass for the finder and the lenses for the eyepieces were also made on it." Evidently Moore and his friends have been making something quite elaborate in the way of a telescope short of a 200-inch. We hope they will some day favor us with a picture of the complete job.

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Mirror Grinding Machines, Seismology?
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