Axis of the

Related to Axis of the: Y axis
the diameter of the sphere which is perpendicular to the plane of the circle.

See also: Axis

References in classic literature ?
In the same way, the angle formed by the rope with the vertical axis of the machine, indicates the velocity.
The steel rod connecting the spring with the propeller was suddenly jerked out of place, at the car end, (by a swaying of the car through some movement of one of the two seamen we had taken up,) and in an instant hung dangling out of reach, from the pivot of the axis of the screw.
A straight line drawn through the axis of the piece would have passed through the center of the orb of night.
A basket I could not make by any means, having no such things as twigs that would bend to make wicker-ware - at least, none yet found out; and as to a wheelbarrow, I fancied I could make all but the wheel; but that I had no notion of; neither did I know how to go about it; besides, I had no possible way to make the iron gudgeons for the spindle or axis of the wheel to run in; so I gave it over, and so, for carrying away the earth which I dug out of the cave, I made me a thing like a hod which the labourers carry mortar in when they serve the bricklayers.
At the two extremities of the port, in order that their fires should converge upon the great axis of the ellipsis formed by the basin, in the first place, two batteries had been raised, evidently destined to receive flank pieces, for D'Artagnan saw the workmen finishing the platform and making ready the demi-circumference in wood upon which the wheels of the pieces might turn to embrace every direction over the epaulement.
Instruments on Earth can measure the tilt of the axis of the sun's magnetic field not only far from the sun but also at the photosphere, its visible surface.