Heliometer
The Optical Dictionary · 1904 · p. 9
A micrometric telescope with bisected object gla .
Bu kavram başka kaynaklarda da geçiyor
Adair's New Encyclopedia (1923)
Chamber's Twientieth Century Dictionary (1908)
Chandler's Encyclopedia (1898)
Nuttall's Standard Dictionary of the English Language (1890)
The Century Dictionary: The Encyelopedic Lexicon of the Englihs Language
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