A section chuck in wood, suitable for spinning a silver jug in the lathe, may be made in this way. Fix a piece of hornbeam of the requisite size on the mandrel and turn it to the shape of Fig. 1; A B is the height of the jug, C D the diameter at its narrowest point, aud A C the profile of its upper part. The diameter of the long cylindrical part C B should be as large as possible without weakening the chuck. Next join a number of wedge-shaped pieces of hornbeam, as shown in Fig. 2; one of the wedges marked 1 should be so shaped that its broadest part turns away from the outside, while the opposite is the case with the other wedges. The joints must be perfect, and are best finished on their joining surfaces with a toothed plane, being so glued together that a piece of brown paper is inserted between each pair of wooden surfaces. Join 1,2,3,1, and 5 together; next 6, 7, S, and 9. It will now be seen that if the free surfaces of 1 and 5, and 6 and 9, are lying in one plane, the last joining will be fairly easy to accomplish. The better plan is to make a drawing, plan down the shape of the wedges, and work accordingly. When all are joined and dry, chuck the roughly cylindrical piece; bore it out, and turn a ring on one end which will fit nicely in the annular recess shown at D (Fig. 1), the cylindrical part C B fitting tightly in the hole bored without forcing the wedges from one another. When this is accomplished, the chuck can be finished to template as Fig. 3. Now separate the wedges, first marking them with lead pencil so as to secure their proper positions. Remove the loose part of the chuck, insert a thin knife blade in any of the glued joints, and tap gently with a mallet on the back of the knife. The wedges, owiug to the brown paper inserted between them, can easily be separated: these nine wedges, when placed on the fixed part of the chuck in their proper rotation, will appear like one single piece. When the metal has been spun home and is removed from the lathe it is evident that all the wedges are inside the bowl of the jug; but when this is released from the fixed part of the chuck, piece 1 (Fig. 2) can be pushed towards the centre and drops out, the other pieces following. Take care that none of the wedges are of larger transverse dimensions than will permit of them passing easily through the narrowest part of the jug's neck; a drawing of the sections should be made before joining them together.

Fig. 2. Making a Wood Chuck in Sections.