Watch genealogist Colleen Fitzpatrick explain how she determined the date of the famous "dead horse" photograph taken in Sheboygan, Wisconsin, during the 19th century using her knowledge of building records, photographic technology, and the Sun's angle at different times of the year.
She gave a presentation about forensic photo analysis at the Los Angeles Archives Bazaar on Oct. 17. You can learn more about Fitzpatrick's work by visiting her Web site or reading a series of four articles about her in the Orange County Register.
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