Manually operated generators for telephone service

Claim 1

A MANUALLY OPERATED GENERATOR FOR TELEPHONE SERVICE COMPRISING A SUBSTANTIALLY HOOD-SHAPED CASING CONSISTING OF ONE SINGLE PIECE OF MAGNETIC SHEET MATERIAL AND HAVING A SUBSTANTIALLY SEMI-CYLINDRICAL BOTTOM PORTION AND A SUBSTANTIALLY RECTANGULAR OPEN-END PORTION; A PAIR OF POLE PIECES HAVING POLE SHOES AND ARRANGED INSIDE SAID HOUSING IN SUBSTANTIALLY COAXIAL RELATION TO SAID SEMI-CYLINDRICAL BOTTOM PORTION THEREOF; A PAIR OF AUXILIARY POLE PIECES HAVING POLE SHOES AND ARRANGED INSIDE SAID HOUSING AND ANGULARLY DISPLACED 90* RELATIVE TO SAID PAIR OF POLE PIECES; EACH OF SAID PAIR OF POLE PIECES SUPPORTING A CYLINDRICAL COIL HAVING A SLIGHTLY SMALLER DIAMETER THAN THE DIAMETER OF SAID SEMI-CYLINDRICAL BOTTOM PORTION; EACH OF SAID PAIR OF AUXILIARY POLE PIECES BEING COILLESS AND ADAPTED TO CONTROL THE MAGNETIC RELUCTANCE OF MAGNETIC CIRCUIT OF THE GENERATOR; A CASTING CAST INTO SAID HOUSING FOR MAINTAINING SAID PAIR OF POLE PIECES AND SAID PAIR OF AUXILIARY POLE PIECES IN POSITION; AN ARMATURE INCLUDING A PERMANENT MAGNET ARRANGED IN THE SPACE BOUNDED BY SAID POLE SHOES OF SAID PAIR POLE PIECES AND BY SAID POLE SHOES OF SAID PAIR OF AUXILIARY POLE PIECES; A SHAFT FOR SUPPORTING SAID ARMATURE; BEARING MEANS FOR ONE END OF SAID SHAFT SUPPORTED BY SAID SEMI-CYLINDRICAL BOTTOM PORTION OF SAID HOUSING; A PAIR OF RECTANGULAR PARALLEL SPACED PLATES INTEGRATED TO FORM A STRUCTURAL UNIT INSERTED INTO SAID HOUSING AND CLOSING SAID OPEN END PORTION THEREOF; BEARING MEANS ON SAID STRUCTURAL UNIT FOR OTHER END OF SAID SHAFT; AND A GEAR TRAIN ADAPTED TO DRIVE SAID SHAFT ARRANGED IN THE SPACE BETWEEN SAID PAIR OF PLATES AND SUPPORTED BY SAID PAIR OF PLATES.