patented boat lifting device any ideas?

while doing my research on lincoln’s contributions to the US government i found out that he patented a boat-lifting device but it doesn’t say what type it was, if it is still in use, or what it looked like or how it worked. does anyone out there have any suggestions as to where i may find out more about this.

and don’t worry this is not an assignment just some curiosity

Lincoln Patent

www.gnc.com

There is a picture of it here
Unfortunately I can’t access it at the USPTO, because it was issued so long ago.

I’m off on a tangent, but I wondered if this would also pique your curiosity.

http://www.scotland.gov.uk/pages/news/extras/00002400.aspx

Same.

(sorry - sleepy person here)