DIMINISH v.
inished column, one whose upper diameter is less than the lower. -- Diminished, or Diminishing, scale, a scale of gradation used in finding the different points for drawing the spiral curve of the volute. Gwilt. -- Diminishing rule (Arch.), a board cut with a concave edge, for fixing the entasis and curvature of a sh…
DIRT n.
In placer mining, earth, gravel, etc., before washing. Dirt bed (Geom.), a layer of clayey earth forming a stratum in a geological formation. Dirt beds are common among the coal measures. -- Dirt eating. (a) The use of certain kinds of clay for food, existing among some tribes of Indians; geophagism. Humboldt. (b) (Me…