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चित्र:Science and Invention Nov 1928 Cover 2.jpg

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विकिमीडिया कॉमन्स का लोगो यह फ़ाइल विकिमेडिया कॉमन्स से है। वहाँ पर इसका विवरण पृष्ठ निम्नोक्त है।
कॉमन्स मुक्त लाइसेंसों के अंतर्गत उपलब्ध मीडिया फ़ाइलों का संग्रह है। आप भी इसमें मदद कर सकते हैं।

Varadhan

सारांश

विवरण

The television image would be viewed through the cone. The image was 1.5 inches square (4 by 4 cm) and had 48 scan lines at 7.5 frames per second. (This was a low definition "48p" display.) The man is using a 125 hertz tuning fork to adjust the scanning wheel to 450 RPM. By looking through the tuning fork at the line pattern on the hub, he could see when the wheel was at the correct speed.

"How to build the S&I Television Receiver" starts on page 618.

Science and Invention, November 1928. Volume 16 Number 7.
Published by Experimenter Publishing. New York, NY.
Editor-in-Chief and Publisher: Hugo Gernsback
Cover Art by R. E. Pattiani.
The page numbers were on an annual basis, not per issue. This issue had pages 577 to 672. The magazine is 8.5 by 11.5 inches.
दिनांक Magazine published November 1928, this page scanned July 2008.
स्रोत This page was scanned by User:Swtpc6800 on an Epson Perfection 1240U at 300 dpi with half-tone de-screening enabled and stored as TIFF. The image was cropped and touched up in Adobe Photo Elements 5.0. This copy saved as a 100 dpi JPG.
लेखक Experimenter Publishing
अनुमति
(इस चित्र का पुनः उपयोग करना)

This 1928 issue of Science and Invention would have the copyright renewed in 1955. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. http://onlinebooks.library.upenn.edu/cce/ The search of the Renewals for Periodicals for 1954, 1955 and 1956 show no renewal entries for Science and Invention.

The copyright on the magazine was not renewed and it is in the public domain.

Science and Invention ceased publication with the August 1931 issue. A search of the copyright renewal records from 1951 to 1959 shows no entries for Science and Invention. All issues are in the public domain.
दूसरे संस्करण Image:Science And Invention Nov 1928 Cover.png

लाइसेंस

Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Science_and_Invention_Nov_1928_Cover_2.jpg

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दिनांक/समयथंबनेलआकारसदस्यप्रतिक्रिया
वर्तमान05:42, 6 अगस्त 200805:42, 6 अगस्त 2008 के संस्करण का थंबनेल संस्करण850 × 1,163 (362 KB)Swtpc6800== Summary == {{Information | Description= ''Science & Invention'', November 1928. Volume 16 Number 7. Hugo Gernsback Editor-in-Chief. Cover Art by R. E. Pattiani. Published by Experimenter Publishing Company. New York, NY. The page numbers were on an

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