its interior in mor- Pa.: " In this vicinity are some springs which yield ' Petrel,' represented in the diagram yonder. (Fig. 3.) tising. In this invention only every alternate spoke is mortised, the others, or supplementary spokes, acting as key s or wedges, yet being firmly held in place by their… … tal spokes. At the bottom of this groove the mortises for the true spokes are cut, which are seated in the usual man- ner, they, with the auxiliary spokes, making a solid continu- ation of the wheel hub, the whole being thus securely locked and fastened. A, in the engraving, Fig. 1, is a section of…
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