...it so that the plane passing through it and the aperture on the second surface should coincide with the plane of the optic axes. In this case, according...appear enlarged in breadth on looking through the aperture on the second surface. But if Professor Hamilton's conclusion be physically exact, the ray...

...it so that the plane passing through it and the aperture on the second surface should coincide with the plane of the optic axes. In this case, according...appear enlarged in .breadth on looking through the aperture on the second surface. But if Professor Hamilton's conclusion be physically exact, the ray...

...aperture for the small circular one, in the plate which covers the first surface of the crystal—that surface being close to the lamp. The linear aperture...azimuth. I found accordingly that the luminous line was undilated, except in the direction corresponding to that of the cusp-ray ; and that in the neighbourhood...

...case, according to the hitherto received views, all the rays transmitted through the second aperture should be refracted doubly in the plane of the optic...should appear enlarged in breadth, on looking through this aperture ; while, according to Sir William Hamilton, the ray which proceeds in the direction OM...

...according to the hitherto received views, all the rays transmitted through the second aperture should be N refracted doubly in the plane of the optic axes, so...should appear enlarged in breadth, on looking through this aperture ; while, according to Sir William Hamilton, the ray which proceeds in the direction OM...

...case, according to the hitherto received views, all the rays transmitted through the second aperture should be refracted doubly in the plane of the optic...part of the line should appear enlarged in breadth in looking through this aperture ; while according to Sir William Hamilton the ray which proceeds in...

...according to tb hitherto received views, all the rays transmitted through the second aperture sluwi-J be refracted doubly in the plane of the optic axes so that no part of the line shouM appear enlarged in breadth in looking through this aperture ; while according '.< Sir William...

...case, according to the hitherto received views, all the rays transmitted through the second aperture should be refracted doubly in the plane of the optic...so that no part of the line should appear enlarged iu breadth in looking through this aperture ; while according to Sir William Hamilton the ray which...

...it so that the plane passing through the line on the first plate and the point in the second, should be the plane of the optic axes. In this case, according...whereas, according to Professor Hamilton's beautiful deduction from the same theory, the ray proceeding in the direction of an optic axis should be refracted...