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).
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Unpublished anonymous paintings remain in copyright until at least 1 January 2040.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
Captions
Black-and-white portrait of Captain Sir John William Alcock
Items portrayed in this file
depicts
portrait
John Alcock
Royal Air Force Personnel and Training Command
copyright status
public domain
data size
649,306 byte
height
1,981 pixel
width
1,953 pixel
media type
image/jpeg
checksum
93ff901441a226f44332523948db4d9aa3a25ebe
determination method or standard: SHA-1
exposure time
0.0166666666666667 second
ISO speed
35
instance of
photograph
File history
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