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ranged to permit the releasement of trace- rings when swung out of the working posi- tion and to prevent such releasement when under draft strain, as set forth. 5 3. In combination with the metallic whiffle- tree end formed with a longitudinal recess a, the hook pivoted to swing into said recess when under draft strain and arranged to have its free end come to a stop against and engage io with the root or end of said recess to prevent any straightening out of the hook by the draft strain, all substantially as set forth.
4. In a whiffietree, the combination, with the longitudinally-recessed metallic ends and the hooks pivoted therein, of the recesses a2, 15 the whole constructed and operating substan- tially as and for the purpose set forth. In witness whereof I have hereunto set my hand this 2d day of February, 1891. LOUIS S. FLATAU. In presence of- STUART WOODSON, GEO. C. IIUDGINS.