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The initial setting operation includes fixing the theodolite on a tripod, along with approximate levelling and centering over the station mark.For setting up the instrument, the tripod is placed over the station with its legs widely spread so that the centre of the tripod head lies above the station point and its head approximately level (by eye estimation).
The level staff is placed with its foot on the point for which the level measurement is required. The telescope is rotated and focused until the level staff is plainly visible in the crosshairs. In the case of a tilting level, the fine level adjustment is made by an altitude screw, using a high accuracy bubble level fixed to the telescope.
2 Transit vs level. 3 comments. ... 4 Temporary adjustment of level. 1 comment. 5 How To Use a Dumpy Level. 2 comments. 6 How different? 1 comment. Toggle the table ...
However, in the case of an automatic level, altitude adjustment is done automatically by a suspended prism due to gravity, as long as the coarse levelling is accurate within certain limits. When level, the staff graduation reading at the crosshairs is recorded, and an identifying mark or marker placed where the level staff rested on the object ...
Horizontal axis adjustment. The horizontal axis must be perpendicular to the vertical axis. Vertical circle index adjustment. The vertical circle must read zero when the line of collimation is horizontal. Adjustment of altitude level. The axis of altitude level must be parallel to the line of collimation. Collimation adjustment.
Common levelling instruments include the spirit level, the dumpy level, the digital level, and the laser level. Levelling staff – specialized measuring stick or vertical staff used with the dumpy level, held by a second person while the operator of the level looks through it and takes readings off of the staff. Also call a rod.
Mar. 8—WILKES-BARRE — Pennsylvania's total non-farm jobs were up 14,800 over the month to a record high of 6,129,900 — the sixth consecutive record high for Pennsylvania's jobs count. Jobs ...
DGS builds all non-highway Capital projects, procures nearly $4 billion of goods and services, serves as the real estate agent for state-owned land and leases, oversees the Commonwealth vehicle fleet, maintains all state-owned facilities, implements an energy-management and conservation initiative in all state-owned buildings, serves as the ...