View of Mount Desert Rock Light Station, showing the boathouse, derrick, workshops, keepers' houses, tower, bell tower, and oil house. The horizon line is very uneven and the photograph is slightly out of focus.
Writing in ink on the envelope is: "Mt. Desert Lt. Sta., Oct. 1907, 4 o'clock, P.M., Taken from water." Written in pencil near the bottom of the envelop is "Print 2 m Sw."