I NOTE with interest Prof. A. V. Hill's letter in NATURE of May 5, describing the use of a Weston ‘photronic’ cell in a differential galvanometer relay. It is somewhat surprising that Prof. Hill's ...
IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. overall: 9 3/8 in x 8 3/8 in x 4 1/2 ...
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