Commons:Deletion requests/File:Recepteur telegraphique tube limaille.jpg
No source information Chetvorno (talk) 18:28, 9 July 2022 (UTC)
To expand on the reason I gave above, this image is a historical black and white photo (colorized by F1jmm) of a coherer radio receiver. This type of receiver was used from about 1900 to 1913, so it is likely this picture was published before 1924 and is in the public domain. However the uploader F1jmm has given no source information, so in spite of it being a valuable illustration for use in our historical radio articles, it should be deleted. Chetvorno (talk) 20:36, 15 July 2022 (UTC)
Keep. According to this, it was published in La Telegraphie Sans Fil (Wireless Telegraphy, 1914), by the French geophysicist Alphonse Berget (1860-1934). It has been more than 70 years since he has died. IronGargoyle (talk) 03:52, 28 November 2022 (UTC)
We have another version as File:Telegraph transmitter-1914-tauleigne.JPG. The image in Berget's 1914 book is here (Gallica). Now, Berget is the author of that book, not the photographer of the image. It says below the image «(Cl. Ducretet et Roger.)» en:Eugène Adrien Ducretet and fr:Ernest Roger were two pioneers of wireless telegraphy, who died in 1915 and 1943 respectively. Are they supposed to be the photographers of this photo? What does the "Cl." stand for? A lot of the images in that book have that "Cl.", so it could mean something like source or courtesy of. Compliment perhaps? --Rosenzweig τ 22:09, 2 December 2022 (UTC)
Kept: I did not find the meaning of CI or CL. However, ducretet (died 1915) was a manufacturer of equipment. When he died he left “the company in the hands of his son Fernand and partner Ernest Roger”. Source of this information: https://www.vintageradio.nl/menu/ducretet_engels.htm . So Ducretet and Roger will probably mean this equipment was made by this firm. Who made the photo is not known. It might be Ducretet (died 1915), Roger (died 1943), or some unknown personnel of the firm. As the photo is from 1902 (possibly second edition of the book), it has probably not been made by Fernand Ducretet, but if he was in the firm already, the copyright will be owned by the firm. In all these cases the copyright is expired. In case the photo was made by the author of the book, Berget, the photo is also in PD. Finally, if the photo is from an anonymous photographer, the photo is in PD, because published more then 70 years ago per Commons:Copyright rules by territory/France. Therefore, in all cases the photo is in PD and can be maintained imho. --Ellywa (talk) 01:26, 3 December 2022 (UTC)
