stle trees formed of angle iron with plate knees are sometimes adopted ; these are securely rivetted to the mast ; the fore part of the angle - iron trestle trees should be round - ed to take the heel of the top Fig . 591 . — Trestle Trees , & c . mast . In the example the cross a , Trestle and… … D rivetted to the top of the floors , Fig . 592 . — Heel of Mast . the tenon being formed of angle > Heel . b , Mast . c , Tenon . , Plate . iron rivetted to this plate , while the bottom of the mast is fitted with a plate and an angle - iron ring rivetted to it , the mortice which the tenon fits…
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