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References
- ↑ Graham, George (1724). "An Account of Observations Made of the Variation of the Horizontal Needle at London, in the Latter Part of the Year 1722, and Beginning of 1723". Philosophical Transactions of the Royal Society . 33: 96–107. doi:10.1098/rstl.1724.0020.
- ↑ Graham, George (1724). "Observations of the Dipping Needle, Made at London, in the Beginning of the Year 1723". Phil. Trans. 33: 332–339. doi: 10.1098/rstl.1724.0062 .
- ↑ "Les pierres de foudre" . Retrieved 2011-10-18.
- ↑ Hecht, Eugene (2002). Optics (4th ed.). San Francisco: Addison Wesley. p. 494. ISBN 0-8053-8566-5.