David F. Whitacre, Biotropica Vol. 13

Donald Perry’s paper describing a method on behalf of climbing safety taking part in regards to tall forest trees is approved in it’s purpose of introducing tropical biologists to specialized techniques acknowledged mostly to cavers and climbers. A hazard exists, however, if people gain experience with such techniques that are outlined in Perry's paper and subsequently apply them with no broaden guidance. The target of this paper is to make known of safety precautions taking part in Perry's paper, to award several tips on the safety procedures of rope-ascending techniques, and to provide sources to acquire equipment and further climbing techniques. The techniques described at this juncture have been used by the author for the period of 10 years of vertical caving and climbing, and taking part in two seasons before climbing tropical forest trees taking part in the track of a study of the bat falcon.

Perry's paper shows non-locking carabiners (steel - aluminum snap-links) linking the jumars (mechanical ascenders) to the slings which support the rock climber. This practice is permitted, yet at the same time as non-locking carabiners can accidentally be opened by making contact with with rope and limbs, which consequential results in a fall. Steel-locking carabiners are preferable to aluminum ones on behalf of this function, at the same time as the latter can experience impairment to threads at the same time as a end result of the harness hurl execution up on the collar of the locking device. If locking carabiners are not on hand, two regular carabiners should be used; taking part in combination with the gates on opposite sides.

While this type of ascender has been acknowledged to disengage inadvertently from the climbing rope lifeline, primarily at what time the rock climber is "ascending" along a horizontal lifeline, it is, nonetheless, probably the safest and overall versatile mechanical ascender on hand and is enjoyable to take advantage of with the proper precautions. Though a person trying to take advantage of mechanical ascenders such at the same time as the jumars; using such ascenders should be aware of the method on behalf of tying and using prusik knots. These knors can come to pass made of camel, nylon, and also polypropylene chains which are relatively low-priced and on hand taking part in the nearly all remote villages. Along these lines, this regularity has the advantages of reduced and advantage taking part in unexpected ascents before emergencies. If habitually inspected on behalf of wear and replaced judiciously, prusik knots are probably safer than mechanical ascenders; many cavers take advantage of them at the same time as their sole process of rise. Prusik knots control at the same time as slip-knots; they can come to pass motivated up before down the rope as soon as a quick loosening wave, but catch and possess at what time significance is functional. Though crude systems employ barely two knots, the three-knot regularity is inherently safer at the same time as it provides an further meaning of attachment to the climbing rope lifeline.

Nonetheless of whether a person uses knots before mechanical ascenders, he can get it useful to move an upgraded prusik during ascents. The rock climber subsequently clips this gathering into a locking carabiner on his chest harness, making it easier to manipulate the other knots before ascenders finished the objective. Essentially, this procedure necessitates the use of two locking carabiners on the parachute before chest harness. The carabiner attached to the ascender before primary chest prusik is on no account unfastened while "on rope." More accurately, a carabiner is used on behalf of clipping into the prusik. If rappelling techniques are used on behalf of descending, it is judicious for all time to comprise one's ascending equipment manageable on one's person, since various contingencies can halt a rappel and necessitate an upward jolt.

Though a parachute harness is probably the most comfortable harness on hand, and along these lines is likely the fundamental worthy by canopy biologists who wear them often for extended periods, I suggest individual chest and individual seat harness on behalf of the person who reads who prefers lighter, though admittedly less comfortable, equipment. Many cavers take advantage of the chest harness on behalf of prusiking. The bulk of the harness is made of nylon seatbelt webbing. Four steel aluminum D-rings, circular rappel rings, and a foot of light webbing are the other supplies desired.

Taking part in final, it is worth stressing the attraction of working with a practiced rock climber while practicing one's skills is encouraged. Occasionally spend time trying and adjusting equipment in advance as well as regularly in a backyard tree beforehand is a prerequisite to safe climbing, and pays impressive dividends for when minor problems arise during a real climb.