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Levelling or leveling (American English; see spelling differences) is a branch of surveying, ... So if Point A is at 1,000 feet of elevation, then Point B would be at ...
The tenths of a foot point is indicated by the top of the long mark with the upward sloped end. The point halfway between tenths of a foot marks is indicated by the bottom of a medium length black mark with a downward sloped end. Each mark or space is approximately 3mm, yielding roughly the same accuracy as the metric rod.
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.
The Fell All-Way precision level, one of the first successful American made bull's eye levels for machine tool use, was invented by William B. Fell of Rockford, Illinois in 1939. [2] The device was unique in that it could be placed on a machine bed and show tilt on the x-y axes simultaneously, eliminating the need to rotate the level 90 degrees.
Sit on machine with back flat against the pad and feet tucked under the padded bar. Adjust bar to rest just above ankles. Extend legs fully, squeezing quads at the top, then lower back down slowly.
It is used in surveying and building with a vertical staff to measure height differences and to transfer, measure and set heights. Also called a builder's level or leveling instrument. Fore sight (FS) – short for "fore sight reading", the last staff reading taken before changing the instrument to the other position. It is the staff reading ...
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