Chemical News and Journal of Industrial Science, Tom 144,Wydanie 3758Chemical news office., 1932 |
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Strona 260
... mirror and mounting for the world's third largest telescope . The completion of the 69 - inch mirror for the Perkins telescope brings to fruition the plans of the late Professor Hiram Mills Perkins of ten years standing . Professor ...
... mirror and mounting for the world's third largest telescope . The completion of the 69 - inch mirror for the Perkins telescope brings to fruition the plans of the late Professor Hiram Mills Perkins of ten years standing . Professor ...
Strona 261
... mirror of 69 - inch diameter could be finished from the crude glass , and that to cut it down to the contem- plated size of 61 inches would be a serious waste of skill which might not be duplicated . After careful consideration , the ...
... mirror of 69 - inch diameter could be finished from the crude glass , and that to cut it down to the contem- plated size of 61 inches would be a serious waste of skill which might not be duplicated . After careful consideration , the ...
Strona 262
... mirror replaces the Newton- ian flat , starlight which is reflected upward from the large 69 - inch concave surface is turned back again towards the lower end of the telescope , passing through a central hole in the large mirror 9 ...
... mirror replaces the Newton- ian flat , starlight which is reflected upward from the large 69 - inch concave surface is turned back again towards the lower end of the telescope , passing through a central hole in the large mirror 9 ...
Spis treści
The Story of the Perkins Reflector | 260 |
Decline in U S Phosphates Output | 266 |
Mohlers Test for Benzoic Acid Edward T Illing B Sc F I C | 269 |
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