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nonbearing walls and partitions, the E 119 Standard specifies that the area J exposed to the fire shall be not less that 100 square feet with neither dimension less than 9 feet. The specimen is restrained on all four edges. The conduct of the fire test of the wall assembly is controlled by the standard time-temperature curve. The temperature fixed by the curve is deemed to be the average temperature obtained from the readings of 10 thermocouples symmetrically disposed and distributed to show the tempera- ture near the face of the test assembly (Figure 1) . The thermocouples are enclosed in protection tubes of such material and dimensions that the time constant of the protected thermocouple assembly lies within the range of 5.0 to 7.2 minutes. The thermocouples are placed six inches away from the exposed face of the sample at the beginning of the test so as not to be touched in the event of deflection of the assembly. The temperatures are read continuously during the test duration. The accuracy of the furnace control is such that the integrated area under the time-temperature curve obtained by averaging the results from all the thermocouple readings is within 10% of the corresponding area under the standard time-temperature curve for fire tests of one hour or less duration, within 7.5% for those over one hour and not sore than two hours, and within 5% for tests exceeding two hours in duration. The unexposed surface temperatures are taken at nine symetrically disposed points (Figure 2) . Thermocouples are not located on or opposite any structural members, reinforcements, or other items which might yield non- realistic temperature data. No temperature is measured nearer than 12 inches from any edge of the assembly. Unexposed surface temperatures are monitored continuously throughout the test. Positions of the thermocouples on the unexposed face are shown in the photographs in the Appendix to this report. Temperatures of the unexposed surface of the assembly are measured with 18 gauge Type K thermocouples placed under standard dry-felted asbestos pads. The wire leads of the thermocouples have an immersion under the pads and are in contact with the unexposed surface 3 1/2 inches with the hot junctions placed approximately under the centers of the pads. The pads are held firmly against the surface and fit closely about the thermocouples. Where required as a condition of acceptance, a duplicate test specimen is subjected to a fire exposure test for a period equal to one half of that indicated as the resistance period in the fire endurance test. Immediately after exposure, the specimen is subjected to the impact, erosion, and cooling effects of a hose stream directed at all parts of the exposed face. The hose stream is delivered through a 2 1/2-inch hose discharging through a smooth bore National Standard Playpipe with a standard taper to a 1 1/8-inch discharge tip at a distance of 20 feet from the center of the exposed face. (Like COMMERCIAL TESTIIIG COMPAAY •�