This article has been edited and included in The Leadhead's Pencil Blog Volume 5; copies are available print on demand through Amazon here, and I offer an ebook version in pdf format at the Legendary Lead Company here.
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David has also run down some of the history concerning the Withers patent pencil. For those who are interested in early American writing instruments, his article is a must-read.
The link to David’s article: http://vintagepensblog.blogspot.com/2017/06/withers-patent-x-patent-discovery.html. He’s allowed me to repost a few of his pictures here:


