He is alone in this lot, it is owned by a J. Clark. He was a carpenter by trade.
Below it states he was an artificer while in service, an artificer is an individual that is responsible for the ammunition and small weapons.
Ancestry.com gives evidence of a military stone.
Isaac F Clark
24 Jul 1862
Rank at enlistment:
Survived the War?:
Enlisted in Company I, Vermont 1st Heavy Artillery Regiment on 01 Sep 1862.Promoted to Full Artificer on 26 Dec 1863.Mustered out on 13 May 1865.
Roster of Vermont Volunteers During the War of the Rebellion 1861-66