Unpublished paper, 'On the relation of the angular aperture of the object glasses of confirmed microscopes to their penetrating power and to oblique light' by J W Griffith
Reference number: AP/36/17
Date: 1854
Description
Griffith writes that it is known that delicate markings on a transparent object, such as the valve of a Gyrosigma, may be rendered more distinctly visible by using an object-glass of large aperture, by bringing the mirror to one side, and by placing a central stop in the object-glass or the condenser or in both; the increased distinctness produced in these several ways being due to the illumination of the object by oblique light. Experiment also shows that the degree of obliquity of the light requisite varies with the delicacy or fineness of the markings, being greater as these are more delicate; so that the finest markings require the most oblique light which can possibly be obtained to render them evident, and the angular aperture of the object-glass must necessarily be proportionately large, otherwise none of these oblique rays could enter it.
Annotations in pencil and ink throughout. Includes two figures in the text of rays of light.
Subject: Optics
Received 29 April 1854. Communicated by Arthur Henfrey.
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 the relation of the angular aperture of the object-glasses of compound microscopes to their penetrating power and to oblique light'.
- Reference number
- AP/36/17
- Earliest possible date
- 1854
- Physical description
- Ink and graphite pencil on paper
- Page extent
- 17 pages
- Format
- Drawing
Manuscript
Creator name
J W Griffith
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Citation
J W Griffith, Unpublished paper, 'On the relation of the angular aperture of the object glasses of confirmed microscopes to their penetrating power and to oblique light' by J W Griffith, 1854, AP/36/17, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/ap_36_17/unpublished-paper-on-the-relation-of-the-angular-aperture-of-the-object-glasses-of-confirmed-microscopes-to-their-penetrating-power-and-to-oblique-light-by-j-w-griffith, accessed on 10 November 2024
Link to this record
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Related Publications
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On the relation of the angular aperture of the object-glasses of compound microscopes to their penetrating power and to oblique light External link, opens in new tab.
Date: 31st December 1856
DOI: 10.1098/rspl.1854.0018
Related Records
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Referee's report by Charles Brooke, on a paper 'On the relation of the angular aperture of the object-glasses of compound microscopes to their penetrating power and to oblique light' by J W Griffith
Creator: Charles Brooke Reference number: RR/2/81
Hierarchy
This item is part of:
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Archived papers: volume 36, scientific papers submitted the Royal Society unpublished or abstracted, 1852-1855
1852-1855 Reference number: AP/36
Related Fellows
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Arthur Henfrey
Communicator
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Archived Papers
Dates: 1768-1989
The 'Archived Papers' collection is comprised of original manuscript scientific papers and letters submitted to the Royal Society which remained unpublished or were abstracted in the journal 'Proceedings of the Royal Society' published from 1830 onwards.View collection