A simple recording balance has been designed for use in high temperature oxidation studies. A helical spring is the weighing mechanism; a light beam and silicon solar cell, the spring position detector. The signal from the solar cell is fed directly to a strip chart recorder without prior amplification. The construction allows for heating of the system which permits the use of the balance in condensable atmospheres. The specifications of the balance in use are: maximum load, 1.5 gj range, 200 mgj sensitivity, 0.5 mg.
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