of its interiorin 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 keys 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…
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