[Fig. 48] shows how the points are turned. After the internal rings are cut out with a quadrant tool like [Fig. 49], and the spur also severed, by cutting in the ends of the holes (not boring them out solid), the globe is put in a shell chuck, with three set screws in it, as shown. The set screws go through the holes in the globe, and the cross pieces, in between the spurs, serve to steady the job. Any number of points may be turned in the globe. [Fig. 50] shows a polygon with many spurs turned inside. At first sight it would appear that the tool, severing the rings, would cut off the points also, but it will be seen that this is not the case, for the holes being bored so as to leave a core standing (which afterward serves to make the points of the spur), the severing tool falls into the holes and goes no further, and each division serves as a guide for the tool in the next hole, so that the globe is made the same size, without jags. The quadrant tool, shown before, must be followed round the shell in the act of cutting it out, so that it will make the same round, and the globe must be shifted in the chuck, to reach all the holes. It is no easy task to make this little affair, for all it looks so simple.
Fig. 49.
Fig. 50.
CHAPTER IX.
FANCY TURNING.
Fig. 51.
