Abstract: The device (9) includes a feed path (P) of the logs (R), configured to feed the logs in a direction orthogonal to the axis of the logs; and one or more pick-up members (27) spaced from one another in a direction transverse to the feed path (P) of the logs (R). The pick-up members are adapted to pick up individual logs (R) from a pick-up position along the feed path (P); and transfer each log (R) from the measuring position back to the feed path substantially in the position in which it was picked up.