Launch of a Sloop of War

 1875 photograph by Whipple and Black Photographers. Curiously, the ship has not been named. 

Update. The ship is the USS Adams, and was laid down by Donald McKay  It was commissioned in 1876 and was was in service till 1919. (thanks, Dave. More in comments)

 The Atlantic Works were located at Marion and Chelsea St. in East Boston.