File:Mark I perceptron.jpeg Source: en.wikipedia.org/wiki/File:Mark_I_perceptron.jpeg

Summary

Media data and Non-free use rationale
Description	The Mark I Perceptron, an early pattern recognition system, at the Cornell Aeronautical Laboratory.
Author or copyright owner	Unknown photographer, presumably working for Cornell Aeronautical Laboratory
Source (WP:NFCC#4)	Original publication: Cornell University Library website Immediate source: https://digital.library.cornell.edu/catalog/ss:550351
Use in article (WP:NFCC#7)	Perceptron
Purpose of use in article (WP:NFCC#8)	To illustrate the first implementation of the perceptron algorithm, and thus the history of pattern recognition.
Not replaceable with free media because (WP:NFCC#1)	I've not been able to find free photos or diagrams of the machine.
Minimal use (WP:NFCC#3)	The image will be shown only in the Perceptron article. According to the originating website, it's a thumbnail (though the largest thumbnail offered for download).
Respect for commercial opportunities (WP:NFCC#2)	The picture is already available online, at a much higher resolution, at no cost.
Fair useFair use of copyrighted material in the context of Perceptron//en.wikipedia.orghttps://demo.azizisearch.com/lite/wikipedia/page/File:Mark_I_perceptron.jpegtrue

This work is copyrighted (or assumed to be copyrighted) and unlicensed. It does not fall into one of the blanket acceptable non-free content categories listed at Wikipedia:Non-free content § Images or Wikipedia:Non-free content § Audio clips, and it is not covered by a more specific non-free content license listed at Category:Wikipedia non-free file copyright templates. However, it is believed that the use of this work:

To illustrate the subject in question
Where no free equivalent is available or could be created that would adequately give the same information
On the English-language Wikipedia, hosted on servers in the United States by the non-profit Wikimedia Foundation,

qualifies as fair use under United States copyright law. Any other uses of this image, on Wikipedia or elsewhere, may be copyright infringement. See Wikipedia:Non-free content and Wikipedia:Copyrights.
Fair use