Photo-chemistry / by S.E. Sheppard.

  • Samuel Edward Sheppard
Date:
1914
Catalogue details

Licence: In copyright

Credit: Photo-chemistry / by S.E. Sheppard. Source: Wellcome Collection.

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    pass through the telescope, the fields being optically reversed by the eyepiece, so that the field diminished by absorption, or other “ object” field,' is again uppermost. To make measure- ments, the Nicols are first set accurately parallel. This is 1 This appears to be a convenient phrase for such circumlocutions as “ the field of the light to be compared,” etc.
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