Method of making a composite metal structure

Claim 1

A METHOD OF CENTRIFUGALLY CASTING AN OUTER BRONZE MEMBER ON A CENTRAL CORE, COMPRISING THE STEPS OF DISPOSING THE CORE HAVING AN OUTER SURFACE TO RECEIVE THE MEMBER WITHIN A MOLD, HEATING THE MOLD TO A TEMPERATURE IN THE RANGE OF 100* TO 1000*F., ROTATING THE MOLD ABOUT THE AXIS OF THE CORE AT A SPEED OF 5 TO 500 R.P.M., POURING THE MOLTEN BRONZE AT A TEMPERATURE IN THE RANGE OF 1800* F. TO 2400*F. INTO THE ROTATING MOLD AND INTO CONTACT WITH SAID SURFACE TO FORM THE MEMBER AND CONTINUING THE POURING OF SAID BRONZE AROUND THE ENTIRE CIRCUMFERENCE OF THE CORE ABOVE THE UPPER EXTREMITY OF SAID SURFACE TO FORM AN ANNULAR RISER, TERMINATING THE POURING WHEN SAID RISER HAS A WEIGHT IN THE RANGE OF 0.2 TO 0.9 TIMES THE WEIGHT OF THE MEMBER, AND SOLIDIFYING THE MOLTEN BRONZE TO FORM AN OUTER MEMBER INTEGRAL WITH THE CORE WITH SAID OUTER BRONZE MEMBER HAVING A FINE GRAIN STRUCTURE AND HAVING MICRO-CONSTITUENTS OF FINE SIZE.

Claim 2

A METHOD OF CENTRIFUGALLY CASTING AN OUTER BRONZE MEMBER ON A CENTRAL CORE, COMPRISING THE STEPS OF DISPOSING THE CORE HAVING AN OUTER SURFACE TO RECEIVE THE MEMBER WITHIN A MOLD, HEATING THE MOLD TO A TEMPERATURE IN THE RANGE OF 100* TO 1000*F., ROTATING THE MOLD ABOUT THE AXIS OF THE CORE AT A SPEED OF 5 TO 500 R.P.M., POURING THE MOLTEN BRONZE AT A TEMPERATURE IN THE RANGE OF 1800* F. TO 2400*F. INTO THE ROTATING MOLD AND INTO CONTACT WITH SAID SURFACE TO FORM THE MEMBER AND CONTINUING THE POURING OF SAID BRONZE AROUND THE ENTIRE CIRCUMFERENCE OF THE CORE ABOVE THE UPPER EXTREMITY OF SAID SURFACE TO FORM AN ANNULAR RISER, TERMINATING THE POURING WHEN SAID RISER HAS A WEIGHT IN THE RANGE OF 0.2 TO 0.9 TIMES THE WEIGHT OF THE MEMBER, AND SOLIDIFYING THE MOLTEN BRONZE TO FORM AN OUTER MEMBER INTEGRAL WITH THE CORE WITH SAID OUTER BRONZE MEMBER HAVING A FINE GRAIN STRUCTURE AND HAVING MICRO-CONSTITUENTS OF FINE SIZE.