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FORE:In spiral gearing the line of force is at an angle of forty-five degrees with the bearing faces of the teeth, and the sliding movement equal to the speed of the wheels at their periphery; the bearing on the teeth, as before said, is one of line contact only. Such wheels cannot be employed except in cases where an inconsiderable force is to be transmitted. Spiral wheels are employed to connect shafts that cross each other at right angles but in different planes, and when the wheels can be of the same size.Such was the end of Fort Loncin, and by its fall the last obstacle was removed by which the undisturbed progress of the German armies might have been prevented. The brave defenders of Loncin did not surrender, but stood their ground until they were buried under the ruins of their own defences. According to information from another source, Lierce had succumbed the night before.

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