Robert McCormick invented a hempbrake, but it was his son Cyrus who came up with this machine
In 1831 
Cyrus and his father had a reaper that cut grain but sank in the mud and failed in 
... Making the hemp-brake machine in Kentucky was hard because building the... [DOC] [TLE] Bookshout [PAR] He fed his country as truly as Washington created it and Lincoln preserved it.