Bell in a vacuum: Fig. 62 shows bell in glass jar from which air has been evacuated. When rung, no sound is heard. Engraving from ''The Philosophical Works of the Hon. Robert Boyle, Esq.'', London, 1725.

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Bell in a vacuum: Fig. 62 shows bell in glass jar from which air has been evacuated. When rung, no sound is heard. Engraving from ''The Philosophical Works of the Hon. Robert Boyle, Esq.'', London, 1725.

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Keywords: 18th, archival, archive, bell, boyle, century, engraving, esq, glass, historical, history, hon., jar, london, philosophical, physics, robert, science, sound, vacuum, works