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ARSTRACT A loading device for use in making the standard load test on refractory brick is de-It consists of two steel shafts plu.; addcd weights, mounted in a simple steel Illustrations show-scribed. frame to provide true direct vertical loads on thc two test samples. ing details of construction arc included.

The importance of the water-smoking period, the work done, and the difficulties often encountered during this period in firing heavy masses are reviewed. The reasons for and the methods of preventing these difficulties are discussed. Maintenance of the dew-point of the kiln gases several degrees below the temperature of the ware that the gases contact until all the ware is heated to 212°F is suggested as a method for obtaining desired kiln conditions and efficient firing. The dew-point is controlled by rate of combustion and amount of excess air. A control system consisting of an aspiration psychrometer and a pyrometer and the method of using these instruments are described.

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