Nuremberg microscope in a tinted photograph.
The gentleman was R. F. Jameson, who was reported to be one month short of his twentieth birthday when he sat before an unknown daguerreotypist's camera in Montrose, Pennsylvania, in October 1846.
Based on that information, he was probably Richard Fletcher Jameson, born on November 17, 1825 in Bridgeport, Montgomery, PA, and died on October 13, 1902 in Smith County, KS. The 1850 US census listed Jameson as being a tailor in Montrose, Pennsylvania.
This image has been passed through numerous web sites, including many tumblr and pinterest accounts. It appears to have originated from Dennis A. Waters Fine Daguerreotypes, Exeter, New Hampshire: http://www.finedags.com
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi
http://mydaguerreotypeboyfriend.tumblr.com/page/5
http://www.themagazineantiques.com/ /early-photographs-dag /