Several single axis, diffraction limited, monolithic autocollimators, capable of resolving less than 10−3 arc s have been designed and built. Their features include small size, lightweight, ruggedness, and ease of operation. Construction features and performance levels are given.
A three component, wind tunnel balance capable of magnetically suspending a test model in the center of a 25 cm diameter, high velocity, low density gas stream without the use of mechanical supports has been developed. Reaction forces experienced by the model are resolved into three mutually orthogonal components with one of these components being aligned with the axis of the tunnel. A complete description of the magnetic and electrical components of the balance is presented.
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