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RefNoAP/36/16
LevelFile
TitleUnpublished paper, 'On a new and more correct method of determining the angle of aperture of microscopic object glasses' by William S Gillet
CreatorGillet; William S (fl 1854)
Date1854
DescriptionGillet explains that the very large apertures assigned to some microscopic object-glasses drew his attention to the importance of testing the accuracy of the method employed to determine their amount. With this object in view, he began with the consideration that the central pencil was alone to be regarded, and that the marginal rays of this were the true limits of the angle of aperture, and that consequently the rays of all oblique pencils were to be excluded, as these might cross at a point not coincident with the principal focus, and being measured separately might form an angle (apparently of aperture) not coinciding of course with the true one, although perhaps not differing from it in amount. He describes his method for determining the angle of aperture.

Followed by two figures illustrating Gillet's method and microscope.

Subject: Scientific apparatus and instruments / Optics

Received 9 March 1854. Read 9 March 1854. Communicated by Charles Brooke.

Whilst the Royal Society declined to publish this paper in full, an abstract of the paper was published in volume 7 of the Proceedings of the Royal Society as 'On a new and more correct method of determining the angle of aperture of microscopic object-glasses'.
Extent17p
FormatDrawing
Manuscript
PhysicalDescriptionInk on paper
Digital imagesView item on Science in the Making
AccessStatusOpen
RelatedMaterialDOI: 10.1098/rspl.1854.0006
Fellows associated with this archive
CodePersonNameDates
NA7650Brooke; Charles (1804 - 1879)1804 - 1879
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