Hydroscope Explained

A hydroscope is any of several instruments related to water:

• One kind is an instrument for making observations below the surface of water,^[1] such as a long tube fitted with various lenses arranged so that objects lying at the bottom can be reflected upon a screen on the deck of the ship that carries it. These are built with a large tire tube that supports the screen and covered by an acrylic dome for protection.^[2]
• Another kind detects subsurface water through nuclear magnetic resonance using the surface nuclear magnetic resonance technique.
• An instrument (likely a hydrometer^{[3] [4]}) described by Synesius in his Letter 15 to Hypatia, written in 402 AD.^{[5] [6]} There are references to such instruments as early as the fourth century.^[7]
• Another ancient Greek instrument: a water clock or clepsydra.^[4]

Notes and References

1. Book: Worthington, David. Dictionary of Environmental Health. Spon Press. 2003. 0415267242. London. 135. en.
2. Book: Giaccardi, Elisa. Heritage and Social Media: Understanding Heritage in a Participatory Culture. Routledge. 2012. 9780415616621. London. 222.
3. Booth, Charlotte (2017), Hypatia: Mathematician, Philosopher, Myth, London: Fonthill Media, pp.113-114
4. Book: Anderson, Marlow. Sherlock Holmes in Babylon: And Other Tales of Mathematical History. Katz. Victor. Wilson. Robin. The Mathematical Association of America. 2004. 0883855461. 57.
5. Web site: Synesius, Letter 015 - Livius. www.livius.org. 2019-02-06.
6. Book: Waithe, M.E. . Ancient women philosophers, 600 B.C. – 500 A.D. . 192 . 1987 . A History of Women Philosophers . 1 . Springer.
7. Book: Forbes, Robert James . A Short History of the Art of Distillation: from the beginnings up to the death of Cellier Blumenthal . 25 . 1970 . Brill.