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Значения термина achromatic object на английском

Значения для термина "achromatic object" отсутствуют.
Использование термина achromatic object на английском
1
To these achromatic object glasses, as they are called, the great development of astronomical knowledge, since Newton's time, is due.
Great Astronomers
2
The achromatic object-glass, invented by Dollond, about 1750, obviates this difficulty, and brings all the rays to nearly the same focus.
Side-Lights on Astronomy and Kindred Fields of Popular Science
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