The matter of is he Henry Wells Holly or Henry W. Holly of an unkown W. is yet to be determined. A visit to the Dedham Public Library to consult with the reference staff there will, hopefully, turn up some solid geneaology information to answer that question.
During the hunt for Mr. Holly, the following patents turned up, some of which match up with Mr. Henry W. Holly of Norwich, Ct., who authored The Carpenter's And Joiner's Hand-Book and a few of which place a Mr. Henry W. Holly a few leagues over in Stamford, Ct. and then in Brooklyn, NY. a number of decades later.
Why all this fuss? I like to know my authors before I reissue a book, particularly when there is so little known about an author and the only reference I can find lacks any concrete biographical information. Remember the bylaw of the research librarian: a library catalog entry is only as good as is the research of the cataloging librarian who created the first entry. If you can find the cataloging librarian who created that first entry. In the case of a library catalog from the 1880's, that a bit of a difficult task.
The Art Of Saw Filing: 1864
The Carpenter's And Joiner's Hand-Book: 1863
Reviewing the signatures, when available, appear to support that all are the same Mr. Holly.