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" A focus of violet light concentrated by a lens 1-2 inches in diameter, and 2-3 inches in focal length, was made to traverse one half of the needle 200 times; and though this experiment was repeated with different needles at different seasons of the year,... "
A Treatise on Optics - Page 85
by David Brewster - 1841 - 418 pages
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A Treatise on Optics

David Brewster - 1831 - 412 pages
...was submitted to the influence of the violet rays. A focus of violet light concentrated by a lens 1.2 inches in diameter, and 2'3 inches in focal length,...fruitless; and they therefore consider themselves as entitled to reject totally a discovery, which for seventeen years has at different times disturbed...
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A Treatise on Optics

David Brewster, Alexander Dallas Bache - 1833 - 674 pages
...of the violet rays. A focus of violet light concentrated by a lens 1.2 inches in diameter, and 2.3 inches in focal length, was made to traverse one half...needles, at different seasons of the year, and different hoars of the day, yet the duration of a given number of oscillations was almost exactly the same after...
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A Treatise on Optics

David Brewster - 1837 - 432 pages
...artificial horse-shoe loadstone, which carried 13£ oz., carried 3J more by three days' exposure, tad at last supported 31 oz., by continuing it in the...fruitless ; and they therefore consider themselves * Etinburgh Journal of Science, New Serin, No. V., p. 76. tld. No. IV., p. 225. H as entitled to reject...
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The Indian Meteorologist's Vade-mecum ...

Henry F. Blanford - 1877 - 308 pages
...for the reasons shewn in the previous chapter.1 The actual variation of the temperature decrement, at different seasons of the year and different hours of the day, is an inquiry of great interest in this connection ; and is one in which residents on the hill slopes,...
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The Pure Theory of Capital

F. A. Hayek - 2007 - 475 pages
...forms (and made his plans accordingly), just as everyone will foresee that he will have different needs at different seasons of the year and different hours of the day. cts of Accumulation of Capital on Relative Values of Commodities But we may begin with the simpler...
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