visual angle

[OPTIC-ANGLE, 1.] visual-cone, s. Perspect.: A cone whose vertex is at the point of IMG:content-0547.png:[blocks in formation] IMG:content-0548.png:[blocks in formation] and is measured by the spirometer (q. v.). vi-tal-işm, s. [Eng. vital; -ism.] Biol.: The doctrine which holds that the vital