| 1. | A hydroscope is an optical device used for making observations deep under water.
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| 2. | Hypatia is given credit for inventing the hydrometer ( or hydroscope ) sometime in the late 4th century or early 5th century.
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| 3. | Despite common belief Hypatia did not invent the hydroscope, although others believe that Hypatia did help other inventors to build the instrument.
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| 4. | 4'In 402, Hypatia receives a letter from the ailing Synesius giving a brief description of what he calls a hydroscope.
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