The ordinary axis is perpendicular to the optic axis. Let formula 3 be their perpendicular distances from the axis of rotation. A carousel provides rotation about a vertical axis. Also included is a horizontal input for plotting dual X-Y axis signals. This is because the velocity of the instantaneous axis of rotation is zero. Their engines were therefore arranged with the piston axis vertical. This indicates the mother spore split into four along a vertical axis. The extraordinary axis is parallel to the optic axis. Consider a charged body rotating about an axis of symmetry. On the vertical axis are paleontological periods. The ulna lacks the part behind the original shaft axis. The normal to d"S" points in the direction of the "z" axis. Motion about this axis is called yaw. Movement of the cylinder on its axis facilitates movement of waste. It is a surface of revolution obtained by revolving a parabola around its axis.