Make tools, fittings, and small metal pieces used in other products.
Tests rubber protective goods, such as gloves, sleeves, blankets or mats, and heavy hoods, used by workers working on high-voltage power lines and equipment: Examines rubber goods to detect defects, such as blisters, breaks, or deterioration. Clips rubber goods to metal rod of dielectric-strength-testing machine and partially submerges articles in water tank of machine. Manipulates controls to discharge excessive voltage through metal rod and rubber goods to water. Observes apparatus for flash or opening of circuit breaker, indicating defective goods. Reads milliammeter on panel to determine if amount of current passed through article to water is within prescribed tolerance. Discards defective equipment. May inflate gloves on special apparatus to detect defects. May make mechanical tests on goods for conformance to purchase specifications, using testing apparatus, such as micrometers, rulers, and tensile-testing machine.