
Thin-Section Petrography of Ceramic Materials
Sarah E. Peterson
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Instap Archaeological Excavation Manual 1
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A water separation, or flotation, machine is an instrument that divides soil into three components: the material that floats (called flot or light fraction), the stones and other heavy portions that do not float (called residue or heavy fraction), and the particles that either dissolve in water or become suspended in it and are washed away.
Description supplied by the publisher.