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16 résultats pour : refractor
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ARP23A16_207
An astronomer and his assistant observing Mercury,...
ARP23A16_216
Robert Stirling Newall's25 - inch refractor on a '...
ARP23A16_217
Refractor on a 'German' equatorial mounting
ARP23A16_215
A refractor with a focal length of120 inches being...
ARP23A16_221
Children looking at the night sky with a portable ...
ARP23A16_209
A 23-inch refractor built by Alvan Clark
ARP23A16_218
A refracting telescope built by Joseph von Fraunho...
ARP23A16_208
A 23-inch refractor built by Alvan Clark
ARP23A16_219
An astronomer and his female assistant observing M...
ARP23A16_116
Children looking at the night sky with a portable ...
ARP23A15_305
An astronomer and his assistant observing Mercury,...
ARP23A16_212
The testing of glass for the 26-inch refractor bui...
ARP23A15_306
An astronomer and his assistant observing Mercury,...
ARP23A16_193
A small refractor mounted on a wheeled frame
ARP23A16_203
An astronomer and his assistant observing Mercury,...
ARP23A13_417
Reflecting telescopes: 1
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