A stoneboat is typically made of two or three oak planks joined by a couple
cross boards bolted together. The thick planks are shaped upward at the
front, to avoid digging into the soil as the boat is moved forward. A chain
is secured at the front, to which the pulling force is attached.
The intelligence of the design is simple: stones are heavy; lifting stones
is hard on the back; rolling stones is easier than lifting them; a wooden
sled that rises but two or three inches off the ground makes for easy
loading of stones by rolling.