English: Mules, and African/American canallers, identified as Henry and Louise Williams and Andy Jenkins (see National Park Service site http://www.nps.gov/resources/story.htm?id=273 also with this same photo). Note the telephone pole in the background with the cable. While it was known that the C&O canal had its own phone system since the 1870's, that pole may have been someone else's, and also it has an awful lot of insulators, for a phone line that only had 3 circuits.
Date
(mid 1800's, since these fellows were boating before 1857 and also after the Civil War)
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