Thermally Stable Truss

Abstract

Lightweight truss made of materials that yield low thermal expansion and contraction. Average coefficient of thermal expansion minus 0.0428 part per million per degree Fahrenheit (0.0770 ppm/degree C) between minus 100 and plus 150 degree F (minus 73 and plus 66 degree C). Rotational distortion of truss less than 1/4 degree as temperature is varied through same range. High thermal conductivity minimizes temperature gradients, minimizing thermal distortions under variety of heating and cooling conditions. Elements of truss readily assembled.