Applied to any directed line, this operator at once turns it, conically, through a definite angle, about a definite axis. [Please select]
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The basal end of each scale is conically hollow, and from the layers of growth conforming to this hollow, there is a false _appearance_ of an open tube running through the scale. [Please select]
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The upper end has a conically-formed cap (F) bolted to the flanges (C), and this has an outlet to which a pipe (G) is attached. [Please select]
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