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Nature
(Thursday, April 21, 1870)
Physics, p. 637
Page 637
![[page image]](http://images.library.wisc.edu/HistSciTech/EFacs/Nature/Nature1/S/0531.jpg)
Based on date of publication, this material is presumed to be in the public domain.| For information on re-use, see: http://digital.library.wisc.edu/1711.dl/Copyright
Nature
(Thursday, April 21, 1870)
Physics, p. 637
Page 637
![[page image]](http://images.library.wisc.edu/HistSciTech/EFacs/Nature/Nature1/S/0531.jpg)
Based on date of publication, this material is presumed to be in the public domain.| For information on re-use, see: http://digital.library.wisc.edu/1711.dl/Copyright