Poynting, J. H. (John Henry), 1852-1914, Shakespear, Gilbert Arden, ed, Barlow, Guy, joint ed · Cambridge, University Press · leaf 674
Fig. 7. EfEect.iof interposition of more permeable medium in radiating field of force. … Kg. 8. Experiment on gravitative permeability (Austin and Thwing). Yet another kind of effect might be suspected. In most crystaUinesubstances the physical properties are different along different directionsin a crystal. They expand differently, they conduct heat differently, andthey transmit hght…
Poynting, J. H. (John Henry), 1852-1914 · Physics
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