objective prism
Americannoun
Example Sentences
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Such a prism placed in front of the objective of a telescope is called an objective prism, and has been used for stellar work with marked success at the Harvard College Observatory.
From A Text-Book of Astronomy by Comstock, George C.
An objective prism eight inches square was attached, and exposures of a few minutes were given to the most sensitive plates that could be procured.
From A Popular History of Astronomy During the Nineteenth Century Fourth Edition by Clerke, Agnes M. (Agnes Mary)
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