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THREE:There was the sound of a faint scratching as if a mouse was working somewhere. The warder in the courtyard pronounced it to be a mouse and passed on. Then a figure, almost invisible in the gloom, crept along the top of the wall and dropped feet foremost into the street. It was nothing but luck that stood Ren�� Lalage in such good stead all along. A crumbling bit of plaster, some repairs going on in the gallery overhead, a ladder and a couple of gimlets left about by one of the carpenters engaged on the job.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.