D is for drain-tile machine invented in Delaware!
While running a search for Thomas Smedley on Ancestry Library Edition his name popped up in the U.S. Patent and Trademark Office Patents, 1790-1909 database. I thought, no that couldn't be him, but when I opened up the link and saw that the patent was for an IMPROVED MACHINE FOR MAKING DRAIN-TILES I knew it was him! Great-gramps was an inventor!
I then discovered that the patent information is also available on Google Books:
And, I also discovered an article in the Scientific American.
The patent was dated September 25, 1865 and according to the Delaware tax assessment list for September 1865 his amount of valuation was 1287 compared to a valuation of 449 for July. Something tells me this machine put a few more dollars in his pocket.
So now it's your turn to join Gould's 'Family History Through the Alphabet Challenge' and tell me what you think D stands for.