I found an old carpenter's hatchet head buried in the dirt the other day, and a google image search found this very cool link with images of many axes and hatchets excavated from an 1863 Army of the Potomac winter encampment in Stafford County, Virginia.
They also quote the Union Army 1865 Quartermaster's Manual regarding axe specifications.
"Felling axes, to be of three sizes, and to be made of the best American iron and steel; blade to be well steeled to the edge; for medium sized axe, length of blade, 7 3/4 inches; width of pole 3 7/16 inches; thickness of pole, 7/8 of an inch; width on edge, 4 3/4 to 5 inches; size of eye 2 3/8 by 3/4 inches, oval in shape. The other sizes to correspond proportionally and with the above specifications, and to all average in weight 56 pounds to the dozen."
"Axe handles, to be made of good, seasoned hickory wood, 34 to 36 inches long, and free from knots or shakes."
My back of the envelope calculation says that 56 pounds to the dozen makes an average 4.5 lb axe if they meant heads only or 3.5 lbs if they were talking hung axes.
I note that there isn't a single double bit described, but they mention that double bits were a fairly new invention at the time, and perhaps the army was to conservative to purchase something so new-fangled.
They also quote the Union Army 1865 Quartermaster's Manual regarding axe specifications.
"Felling axes, to be of three sizes, and to be made of the best American iron and steel; blade to be well steeled to the edge; for medium sized axe, length of blade, 7 3/4 inches; width of pole 3 7/16 inches; thickness of pole, 7/8 of an inch; width on edge, 4 3/4 to 5 inches; size of eye 2 3/8 by 3/4 inches, oval in shape. The other sizes to correspond proportionally and with the above specifications, and to all average in weight 56 pounds to the dozen."
"Axe handles, to be made of good, seasoned hickory wood, 34 to 36 inches long, and free from knots or shakes."
My back of the envelope calculation says that 56 pounds to the dozen makes an average 4.5 lb axe if they meant heads only or 3.5 lbs if they were talking hung axes.
I note that there isn't a single double bit described, but they mention that double bits were a fairly new invention at the time, and perhaps the army was to conservative to purchase something so new-fangled.