I think it is a different Rev. Metcalf.
The following link mentions a Metcalf telescope:
http://dasch.rc.fas.harvard.edu/telescopes.php
"This telescope was first used at Rev. Metcalf's observatory in Taunton, Massachusetts from 1905 through at least 1913"
(Note the location in Taunton, MA about 40 miles south of Harvard)
This link mentions another Metcalf telescope:
http://www.assabfn.co.za/friendsofboyde ... 10inch.htm
"The 10" Metcalf was built by Joel H. Metcalf, a noted amateur astronomer of the 19th and early 20th century."
The Wikipedia article on Joel H. Metcalf says:
"Joel Hastings Metcalf (January 4, 1866–February 23, 1925) was an American astronomer.
Metcalf graduated from Harvard Divinity School in 1892. He served as a Unitarian minister in Burlington, Vermont and
in Taunton, Massachusetts, Winchester, Massachusetts and Portland, Maine.
He discovered or co-discovered several comets, including 23P/Brorsen-Metcalf and 97P/Metcalf-Brewington,
and also a number of asteroids. Asteroid 792 Metcalfia is named in his honour."
(Note the mention of Taunton, MA again and the connection to Harvard.)