A treatise on the magnet ... with tables of the variation of the magnetic needle ... a description of a ... meridional and azimuth compass, etc / [Ralph Walker].
- Walker, Ralph
- Date:
- 1798
Licence: Public Domain Mark
Credit: A treatise on the magnet ... with tables of the variation of the magnetic needle ... a description of a ... meridional and azimuth compass, etc / [Ralph Walker]. Source: Wellcome Collection.
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