Abstract
The demands now made upon the sensitivity and reliability of some classes of electromechanical instruments make it imperative that particulate and other contamination should be excluded from the instrument during assembly. For this purpose it is now usual to install special ‘Clean Areas’ in which such instruments may be assembled under conditions of extreme cleanliness. The paper summarizes modern practice in the planning, design, and operation of clean areas in a manner which it is hoped will provide guidance to those having to build or operate such areas. Mention is made of ways in which the design of components and equipment can assist clean assembly and the hope is expressed that the technology of clean assembly may be put on a more rational basis by means of a scientific study of the ways in which contamination can enter and disturb instruments and mechanisms.
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