IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This plaster model was most likely ...

THERE is a point in connection with the ordinary expositions of Fresnel's theory of double refraction to which, on account of its frequent occurrence, it is perhaps worth while to direct attention. It ...

WHEN polarised light passes through an optically active liquid in an electrostatic or a magnetic field the phenomenon of double refraction observed with a non-active substance is complicated by the ...