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Derby or hawk / Float
- a flat board usually around 18" square with a projection on its underside
which allows it to be hand held, used by plasterers to carry a small amount of
the material they are working to the wall face, to which it is smoothed on
using a plasterers trowel often referred to simply as a
float, sometimes as a dove.
A float with a
nail in it, used to give a light scratch to provide a key for a finishing coat,
is sometimes referred to as a devil float.