324 Art of Travel.
Parbuckl iny.-A round log or a barrel should be rolled, not dragged; and many irregularly-shaped objects may have bundles of faggots lashed round them, by which they become barrel-shaped and fit to be rolled. In these cases, parbuckling doubles the ease of rolling them ; one or more ropes have one of each of their ends made fast in the direction to which the log has to be rolled, while the other is carried underneath the log, round it, and back again. By pulling at these free ends, the log will be rolled on. An equivalent plan, and in some
cases a more practicable one, is to make fast one end of the rope to the log itself; then, winding the rope two or three times round it, like cotton on a reel, to haul at the free end as before. Horses can be used, as well as men, for this work.
Accumulation of Eforts.-South American Indians are said to avail themselves of their forest trees, and of the creepers which stretch from branch to branch, in moving very heavy weights, as in lifting a log of timber up on a stage to be sawn, in the following ingenious manner. The labourer gets hold of one of these creepers that runs from the top boughs of a tree in the direction in which he wants to move his log, and pulling this creeper home with all his force, bending down the bough, he attaches it to the log ; then he goes to another creeper and does the same with that ; and so on until he has the accumiTlated strain of many bent boughs, urging the log forward and of sufficient power to move it.
Short cords of india-rubber with a hook at either end, are sold under the name of " accumulators." It is proposed that each of these should be stretched and hooked by one of its ends to a fixed ring, and by the other, to the body to be moved; by applying a number of these, in succession, an immense accumulation of force can be obtained.
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