A modification to the Livingstone, called the Bolivia corer, replaces the Livingstone’s 2-inch (5 cm) steel barrel with standard polycarbonate tube, eliminating the need to extrude cores and providing superior retention of upper watery sediments. When a depth is reached at which sediments are too tough for the polycarbonate tube (usually at least several meters below lake floor, depending on sediment characteristics), it only takes a few minutes to switch to the steel barrel and continue coring in the same hole. The Bolivia can also be deployed with a square rod long enough to take 1.5-meter drives, increasing efficiency in both coring time and polycarbonate tubing utilization. Maximum depths attainable.
Instructions for the operation of the Bolivia corer.