RULE v.
To mark with lines made with a pen, pencil, etc., guided by a rule or ruler; to print or mark with lines by means of a rule or other contrivance effecting a similar result; as, to rule a sheet of paper of a blank book. Ruled surface (Geom.), any surface that may be described by a straight line moving according to a giv…
SLATE n.
lobe, a globe the surface of which is made of an artificial slatelike material. -- Slate pencil, a pencil of slate, or of soapstone, used for writing on a slate. -- Slate rocks (Min.), rocks which split into thin laminæ, not necessarily parallel to the stratification; foliated rocks. -- Slate spar (Min.), a variety…
SPOT n.
-- Spot lens (Microscopy), a condensing lens in which the light is confined to an annular pencil by means of a small, round diaphragm (the spot), and used in dark-field ilumination; -- called also spotted lens. -- Spot rump (Zoöl.), the Hudsonian godwit (Limosa hæmastica). -- Spots on the sun. (Astron.) See Sun spot,…
STUMP n.
aper, cut to a point, or any similar implement, used to rub down the lines of a crayon or pencil drawing, in shading it, or for shading drawings by producing tints and gradations from crayon, etc., in powder.