Word: lensed
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The photographs of the spectra of the stars taken at the Harvard College Observatory as part of the Henry Draper Memorial differ in two respects from those ordinarily taken elsewhere. Instead of using a spectroscope with a slit, in which but one star is photographed at a time, large prism...
Coming now to the method of taking photographs, the lecturer showed the difference in the process. In taking a photograph with cathode rays a plain dry plate is used. There are the customary slides in the holder but there is no central opaque partition. The hand or object to be...
CAMERA FOR SALE.- Folding Hawkeye, 5x7, fine lens and shutter, six plate holders and compact tripod.
CAMERA FOR SALE.- Folding Hawkeye, 5x7, fine lens and shutter, six plate holders and compact tripod.
The new telescope for the Chicago University will not be ready for use till the fall of 1893. The lens will be cast by Alvin G. Clark, and will be forty-five inches in diameter; or eleven inches larger than that in the great Lick telescope.