1. THE METHOD OF INCORPORATING INTO A DIMENSIONALLY STABLE WEB A FLEXIBLE THREAD IN PERMANENTLY WAVE-LIKE FORM WHICH COMPRISES FEEDING SAID WEB AND SAID THREAD ADJACENT EACH OTHER AT THE SAME LINEAR SPEED THROUGH A PRELIMINARY ZONE AND TOWARD A PRESSURING ZONE, YIELDINGLY UNIFORMLY RESTRICTING MOVEMENT OF SAID THREAD RELATIVE TO SAID WEB IN SAID PRELIMINARY ZONE DIRECTLY INTO AND SAID WEB IN SAID PRELIMINARY ZONE, PASSING SAID WEB SAID PRESSURING ZONE, PRESSING SAID THREAD AGAINST SAID WEB IN SAID PRESSURING ZONE AND ELONGATING SAID THREAD FROM SAID PRESSURING ZONE INTO SAID PRELIMINARY ZONE WHEREBY SAID THREAD IS PRESSED AGAINST SAID SEALED ONTO SAID WEB IN SAID PRESSURING ZONE, AND SAID THREAD IS IN-