Moving back and forth through the blade on a motorized carriage, long poplar logs that the guys harvested off their Gilmanton farm are cut into planks that they'll use this spring to build a new 30-foot-by-40-foot barn for some of their 85 head of beef cattle. New Hampshire has deep connections to timber that go back to the 1600s when the state sent white pine trunks to England to make ships' masts.