The method employed did not admit of the production of such high magnetizing forces, but was of special interest in that both B and I were measured optically-B by means of the rotation of a polarized ray inside a glass plate, as before described, and I by the rotation of a polarized ray reflected from the polished surface of the magnet ized metal (see " Ker.r's constant," Magneto-Optics).
P. Ker, in the Fortnightly Review (July, 1904); M.
P. Ker, Epic and Romance (2nd ed., 1908).
The "spacious arches of stone and other vestiges of departed majesty," with which Ker Porter found it surrounded in 1818, were possibly remains of the college (medresseh) and monastery (zavieh) where Ibn Batuta found shelter during his visit to the locality.
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