Abstract
A “calculation aid” which copes with powders of different densities, powder “beds” of different porosities and cross-sectional areas, and various types of permeametric apparatus, has been found to be of particular value when working with friable materials and explosives (e.g. RDX and HMX) where it may be inappropriate to compress a bed of the powder to a fixed voidage. The device consists of a single scale marked on a sliding strip, which replaces the orthodox strip in the stock of a normal slide-rule, and which enables the specific surface areas of powders to be calculated in a second or two.
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