The characteristic optical properties of gold, combined with its complete resistance to attack in any surroundings and its ability to be applied as very thin films, have led to a number of interesting and diverse applications in industry. The author, formerly Research Manager to the Metals Department of DEGUSSA, reviews these uses and the special properties upon which they are based. There are several technical applications of gold where its optical properties are of prime importance and can contribute to the solution of various problems. These include: The highly reflecting surfaces of satellites and space vehicles, of instruments on space capsules, and of space suits. Reflectors with glass or metal backing in heating or cryogenic temperature engineering. Plate glass windows in the motorcar and building industries for up to 50 per cent light transmission within certain frequency ranges and maximum reflection in other ranges. Diffraction screens for optical instruments for certain wavelength ranges to act as focusing lenses, and also highly reflecting graduated scales. Surface deposits on the solar energy distributors of solar cells to absorb radiated heat and to maintain the solar cells at optimum operating temperatures.

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