It consisted of a graduated circle inside which another could slide, carrying two small tubes diametrically opposite, the instrument being kept vertical by a plumb-line.
It differs from the astronomical latitude only in being corrected for local deviation of the plumb-line.
But even such an attempt to systematically plumb the universe can only make us acquainted with the merest inside shell.
Adjust the length of the plumb-line until it and the body oscillate together in unison.
48) and hang near it a small plumb bob.
As thus determined it is the angle between the direction of the plumb-line at the place and the plane of the equator.
This is called " quadrant elevation," and the proper inclination was given by means of the " gunner's quadrant," a quadrant and plumb bob, one leg being made long to rest in the bore, or by bringing lines scribed on the breech of the gun in line with a pointer on the carriage; these were called " quarter sights."
It was ranged by varying the charge, and layed for line by means of a line and plumb bob Laying aligned on a picket.
ZENITH (from the Arabic), the point directly overhead; its direction is defined by that of the plumb-line.
It is considered to be an extinct volcano because it makes the plumb-line deviate only 7" to 8", from which it is deduced that the mountain is hollow.
The hills were a profusion of snowy dogwood and pink plumb and cherry blossoms.
Then the plumb line not only defines the zenith as already shown, but in a downward direction it defines the nadir, which is the point of the sphere directly below our feet.
I.): " Raise the sight, and if it keeps in line with a plumb bob, it can be as confidently relied upon as the line of metal, if the trunnions are horizontal.
In astronomy the horizon is that great circle of the sphere the plane of which is at right angles to the direction of the plumb line.
One hypothesis was: while y Draconis was stationary, the plumb-line, from which the angular measurements were made, varied; this would follow if the axis of the earth varied.
This silence was broken by one of the brethren, who led Pierre up to the rug and began reading to him from a manuscript book an explanation of all the figures on it: the sun, the moon, a hammer, a plumb line, a trowel, a rough stone and a squared stone, a pillar, three windows, and so on.
The deviation from the vertical, was regulated and measured by the introduction of a screw and a plumb-line.
Newton called attention to the fact that a falling body moves in a curve, diverging slightly from the plumb-line vertical.