The Upper Congo As a Waterway

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The Upper Congo As a Waterway
George Grenfell
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This is especially the case on down- ward journeys, much time being frequently lost in pushing or in warping ofi". If the steamer draws 3 feet or so, the crew can generally THE UPPER CONGO AS A WATERWAY. 7 solve the difficulty in a little while by jumpiug into the water and pushing in the required direction, two or three of them being occupied the meanwhile in searching for deeper water, and, having found it, they form into a lino of living buoys, indicating the best route across a shallow patc...h. If mere pushing is not enough, the anchors of shallow boats can easily be carried out into 4 or 5 feet of water and the winch be brought into requisition for the work of warping oflf. But when the boat draws -i feet or more, anchors have to be carried out by means of boats or canoes, and warping off becomes an especially wearisome operation. Stern- wheelers can cope much more speedily with the difficulties furnished by sandbanks than is the case with screw-propellers. If a stern-wheeler sits down on a sandbank, it is mostly a matter of keeping the engines going astern for a time, and the violent wash caused by the paddles will excavate a channel ; the screw-propeller, on the other hand, simply excavates a deep hole immediately under the stern, while at the same time it drives a lot of sand into the stern tube bushings, and grinds the shaft and bearings away in a fashion that is simply terrible from the engineers' point of view.

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