Temporary Adjustment Of Dumpy Level Pdf Download [TOP]
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In any theodolite, the vertical is the one in which the object is observed. The axis must be adjusted so that it is perpendicular to the vertical direction. We call it a center-point and it is the starting point for the observations. The center-point can be achieved in two ways. First the instrument is aimed to the object and the operator returns to center-point and then the instrument is adjusted to the center-point. The second way of center-pointing is to aim the instrument at center-point and then adjust it so that the object is at the center of the field of view.
In a theodolite, the horizontal axis is the one in which the object is observed. The axis must be adjusted so that it is perpendicular to the vertical direction. We call it a center-point and it is the starting point for the observations. The center-point can be achieved in two ways. First the instrument is aimed to the object and the operator returns to center-point and then the instrument is adjusted to the center-point. The second way of center-pointing is to aim the instrument at center-point and then adjust it so that the object is at the center of the field of view.
In a theodolite, the horizontal axis is the one in which the object is observed. The axis must be adjusted until the instrument is aimed at a known point. We call it a zero-point and it is the starting point for the observations. It can be done in two ways. First the theodolite is aimed to the object and the operator returns to zero-point and then the instrument is adjusted to the zero-point.The second way of zero-pointing is to aim the instrument at zero-point and then adjust it so that the object is at the center of the field of view. A surveyor can estimate this point by comparing the transit of the object with the one printed on the instrument. He can also use a theodolite with a plumb bob to get this point and then adjust the instrument. This is called a plumb-point.
In a theodolite, the vertical axis is the one in which the object is observed. The axis must be adjusted so that it is perpendicular to the horizontal direction. We call it a zero-point and it is the starting point for the observations. It can be done in two ways.
Correcting / Re-adjustingVertical Adjustment: Aim: Vertical axis perpendicular to VNecessity: If the vertical axis is not prospered to V when the telescope is transited we do not get the horizontal plane but it will be scant thus when prolonging a line or while transferring foundation points we do not get the designed straightness.For correcting or re-adjusting vertical axis see Above .Testing: 1. Instrument is established nears to high rised object like transmission town or multistoried building with all temporary adjustments. 2. Top of the object is bisected and horizontal plate is clamped. Telescope is rotated down to get a point on the ground mares to the station pt.(B) 3. Telescope is made to transit & the instrument swing back to bisect B again 4. 827ec27edc