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File:Frank Twyman.png

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Summary

Description
English: Photograph of British optical engineer Frank Twyman (1876–1959).
Date
Source Optics in Radio Transmission and other fresh fields (1930) in Transactions of the Optical Society, Volume 31, Issue 3
Author Unknown authorUnknown author

Licensing

Public domain logo
This UK artistic or literary work, of which the author is unknown and cannot be ascertained by reasonable enquiry, is in the public domain because it is one of the following:
  • A photograph, which has never previously been made available to the public (e.g. by publication or display at an exhibition) and which was taken more than 70 years ago (before 1 January 1954); or
  • A photograph, which was made available to the public (e.g. by publication or display at an exhibition) more than 70 years ago (before 1 January 1954); or
  • An artistic work other than a photograph (e.g. a painting), or a literary work, which was made available to the public (e.g. by publication or display at an exhibition) more than 70 years ago (before 1 January 1954).

Warning sign This tag can be used only when the author cannot be ascertained by reasonable enquiry. If you wish to rely on it, please specify in the image description the research you have carried out to find who the author was. The above is all subject to any overriding publication right which may exist. In practice, publication right will often override the first of the bullet points listed.

Unpublished anonymous paintings remain in copyright until at least 1 January 2040. This tag does not apply to engravings or musical works. More information
Public domain
Public domain
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

Captions

British optical engineer Frank Twyman

Items portrayed in this file

depicts

Frank Twyman

media type

image/png

File history

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Date/TimeThumbnailDimensionsUserComment
current01:49, 25 May 2022Thumbnail for version as of 01:49, 25 May 20221,145 × 1,558 (573 KB)LittleDwangsCropped 30 % horizontally, 41 % vertically using CropTool with lossless mode.
01:47, 25 May 2022Thumbnail for version as of 01:47, 25 May 20221,640 × 2,656 (949 KB)LittleDwangsUploaded a work by {{Author|Unknown}} from [https://doi.org/10.1088/1475-4878/31/3/301 Optics in Radio Transmission and other fresh fields] (1930) in ''Transactions of the Optical Society'', Volume 31, Issue 3 with UploadWizard

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