Strain gages and manufacture of same

Claim 1

IN A STRAIN GAGE, THE COMBINATION OF A GENERALLY TUBULAR, METALLIC GAGE HOUSING HAVING AN OPEN END, A CLOSED END AND CAPABLE OF BEING ATTACHED THROUGHOUT ITS LENGTH BY WELDING TO A TEST SPECIMEN, A STRAIN RESPONSIVE ELONGATED RESISTANCE ELEMENT THE RESISTANCE OF WHICH VARIES IN ACCORDANCE WITH THE STRAINS APPLIED LONGITUDINALLY THERETO, A MASS OF COMPACTABLE, SOLID ELECTRCIAL INSULATING MATERIAL DISPOSED IN SAID HOUSING, SAID HOUSING EXERTING A COMPRESSIVE FORCE ON SAID INSULATING MATERIAL AND SAID RESISTANCE ELEMENT WHEREBY STRAINS DIRECTED GENERALLY LONGITUDINALLY OF THE HOUSING AS A RESULT OF DIMENSIONAL CHANGES OF THE TEST SPECIMEN TO WHICH THE HOUSING IS ATTACHED ARE TRANSMITTED FROM SAID HOUSING TO SAID RESISTTANCE ELEMENT, LEAD WIRES INTEGRALLY ATTCHED TO SAID RESISTANCE ELEMENT EXTENDING THROUGH THE OPEN END OF SAID GAGE HOUSING AND CONNECITNG SAID ELEMENT TO AN ELECTRICAL RESISTANCE MEASURING CIRCUIT, AND A GENERALLY TUBULAR HOUSING SURROUNDING SAID LEAD WIRES AND INTEGRALLY ATTACHED TO SAID GAGE HOUSING.