Abstract
Measurements of attenuation have been carried out for all the boundary conditions discussed in Part 1 of this paper when a number of screens interrupt the line of sight to the source. Under most of the boundary conditions used an unexpected downward shift in the attenuation curve occurs which may be described both by the first attenuation law mentioned in Part 1 and by a new second attenuation law. A theoretical model of a single screen in an office has been developed which produces attenuation curves showing reasonable agreement with measured attenuations under the same conditions.
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