A specially graduated arc attached to the vertical circle of an alidade or transit to simplify the computation of elevation differences for inclined stadia sights without the use of vertical angles. The arc is so graduated that each division on the arc is equal to 0. Named after William M. Beaman , U. It involves flipping four times, while body also spins with five complete rotations on a sideways or downward-facing axis. The trick
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An attachment to an alidade consisting of a stadia arc on the outer edge of the visual vertical arc; enables the observer to determine the difference in elevation of the instrument and stadia rod without employing vertical angles. An instrument in which the difference in pressure between two sources is determined from the vertical distance between the surfaces of a liquid in two legs of an erect or inverted U-shaped tube when each of the legs is connected to one of the sources.
Angular distance above the horizon; the arc of a vertical circle between the horizon and a point on the celestial sphere, measured upward from the horizon. Angular distance below the horizon is called negative altitude or depression.
Altitude indicated by a sextant is called sextant altitude. After all corrections are applied, it is called corrected sextant altitude or observed altitude. An altitude taken directly from a table, before interpolation, is called tabulated altitude.
After interpolation, or if determined by calculation, mechanical device, or graphics, it is called computed altitude. If the altitude of a celestial body is computed before observation, and sextant altitude corrections are applied with reversed sign, the result is called precomputed altitude.
The difference between computed and observed altitudes corrected sextant altitudes , or between precomputed and sextant altitudes, is called altitude intercept or altitude difference. An altitude deter- mined by inexact means, as by estimation or star finder, is called an approximate altitude. The altitude of a celestial body on the celes- tial meridian is called meridian altitude. The expression ex- meridian altitude is applied to the altitude of a celestial body near the celestial meridian, to which a correction is to be applied to deter- mine the meridian altitude.
A parallel of altitude is a circle of the celestial sphere parallel to the horizon, connecting all points of equal altitude. The angle in a vertical plane between the horizontal and an ascending line, as from an observer to an object. A systematic correction that must be applied to a measured difference in elevation since level surfaces at varying elevations are not absolutely parallel. First time here? Check out the FAQ!
If you've arrived to new location and wonder how to dress comfortably according to weather, check Comfiesto. Name: Email: How can we help you? The degree of ability of a radar set to indicate separately the echoes of two targets in range, bearing, and elevation. Resolution in range is the minimum range difference between separate targets at the same bearing which will allow both to appear separately; Resolution in bearing is the minimum horizontal angular separation between two targets at the same range which will allow both to appear separately.
Resolution in elevation is the minimum separation in the vertical plane between two contacts at the same range and bearing which will allow both to appear as distinct echoes. A supporting cable that prevents a more or less vertical object from falling forward. A spring used to keep together the cutting edges of purchase shears.
A rod that runs from either end of a carriage's rear axle to the reach. A leather strip that covers and strengthens a shoe's back seam. Heeling adjuster. An instrument that measures the change of elevation of a vehicle. Related questions. ALTITUDE Angular distance above the horizon; the arc of a vertical circle between the horizon and a point on the celestial sphere, measured upward from the horizon.
Definition of Beaman stadia arc