Field spider and pole piece for electrical machines

Claim 1

IN AN ELECTRICAL MACHINE HAVING A REVOLVING FIELD MEMBER COMPRISING A FIELD SPIDER AND POLE PIECES SECURED TO SAID SPIDER: SAID SPIDER BEING A ONE-PIECE ELEMENT AND EACH OF SAID POLE PIECES BEING A ONE-PIECE ELEMENT, SAID SPIDER BEING PROVIDED AROUND IT PERIPHERY WITH DOVETAIL GROOVES AND EACH OF SAID POLE PIECES BEING PROVIDED ALONG ITS INNER SIDE WITH A DOVETAIL TENON FOR COOPERATION WITH ONE OF SAID DOVETAIL GROOVES, THE LANDS FLANKING EACH OF SAID DOVETAIL GROOVES IN SAID SPIDER HAVING A SERIES OF PERIPHERAL SLOTS TRANSVERSELY INTERSECTING SAID GROOVE, THE SLOTS OF EACH SERIES BEING SPACED APART TO THEREBY DIVIDE EACH OF SAID LANDS INTO A PLURALITY OF SEPARATE LANDS, THE SLOTS IN SAID LANDS EXTENDING BELOW THE DEPTH OF THEIR RESPECTIVE GROOVES, THE TENON OF EACH OF SAID POLE PIECES HAVING A SERIES OF TRANSVERSE SLOTS SPACED APART ALONG THE LENGTH OF SAID TENON TO THEREBY DIVIDE SAID TENON INTO A PLURALITY OF INDIVIDUAL TENONS, THE SLOTS IN EACH OF SAID POLE PIECES EXTENDING INTO THE BODY OF SAID POLE PIECE PAST THE POINT WHERE THE TENON MEETS THE BODY OF SAID POLE PIECE, AND A PLATE COVERING EACH END OF EACH OF SAID DOVETAIL GROOVES, SAID PLATES BEING SECURED TO THE ENDS OF SAID SPIDER.