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Jakob Ehrensvärd | all galleries >> Industrial >> The Limestone ropeway > BF5T1600.jpg
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The two-wire system used by the cableway poses one problem "by design" which can be understood by this picture. The lower drive wire must have certain amount of slack and as the buckets passes over the pivot points at the top of the pylons, a "whip" wave follows the drive wire and jerks the other buckets. Depending on the loading and the number of buckets on the particular section, this can cause oscillations which ultimately lead to derailments. Interestingly enough, here the buckets are all empty and it can be easily understood that when they were loaded with some 1200 kg of limestone each, the side carrying the loaded ones was hanging deep compared with the side having the unloaded ones. The slack which can be seen on the picture seems large indeed, but after all, it seems like the system worked well and derailments were rare. However, after almost sixty years of operation, there is presumably a large number of derailed buckets at the bottom of this very lake.

Far in the background, a giant tower can be seen which adds tension to the upper wire.

Canon EOS 1Ds
1/1000s f/8.0 at 260.0mm iso100 full exif

other sizes: small medium original
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