...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」
...These observational curves soobtained have next to be fed into a fearfully complex machine, which itwould take a whole lecture to make even partially intelligible, but shows its aspect...
Oliver Lodge 「Pioneers of 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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