“Non vi è peggior schiavitù di quella che s'ignora.”
A Treatise on the Theory of Screws https://books.google.com/books?id=ECZ-MkhTdvkC 1900 p. 173
Robert Stawell Ball:
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Robert Stawell Ball: Frases em inglês
The Cause of an Ice Age, London, 1891, p. 3
Name for hypothetical planet nearer the Sun than Mercury
The Story of the Heavens, London, 1893, p. 122
A Treatise on the Theory of Screws https://books.google.com/books?id=ECZ-MkhTdvkC 1900 p. 173