... up the rough elements fromthe observational instruments in theturret...
Various 「Astounding Stories of Super-Science, March 1930」
...Refracting astronomical telescopes are now constructed on thisprinciple, it having been discovered that for observational purposesthey possess several advantages over the Galilean instrument...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...His work was not mainly in the field of observational astronomy, andtherefore did not materially influence that branch of science...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...Nor was activity confined to the observational side of the science...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
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