The slide rule does not have a copyright notice on it, and works published in the U.S. without a copyright notice before 1977 are in the public domain. I therefore think the slide rule itself is in the public domain under U.S. law. I'm making this diagram available under GFDL license.
The original description page was here. All following user names refer to en.wikipedia.
2005-04-30 04:47 Bcrowell 456×40× (4493 bytes) This was made by manipulating a scan of a Pickett pocket slide rule, done by me, Benjamin Crowell, in 2005. The slide rule does not have a copyright notice on it, and works published in the U.S. without a copyright notice before 1977 are in the public dom
2005-04-30 04:36 Bcrowell 456×40× (10473 bytes) This was made by manipulating a scan of a Pickett pocket slide rule, done by me, Benjamin Crowell, in 2005. The slide rule does not have a copyright notice on it, and works published in the U.S. without a copyright notice before 1977 are in the public dom
The original description page was here. All following user names refer to he.wikipedia.