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The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...
4 Temporary adjustment of level. 1 comment. 5 How To Use a Dumpy Level. 2 comments. 6 How different? 1 comment. Toggle the table of contents. Talk: Level (optical ...
The level must be horizontal to get a valid measurement. Because of this, if the horizontal crosshair of the instrument is lower than the base of the rod, the surveyor will not be able to sight the rod and get a reading. The rod can usually be raised up to 25 feet high, allowing the level to be set much higher than the base of the rod.
For example, a typical stadia mark pair are set so that the ratio is 100. If one observes a vertical length on a stadia rod, rule or levelling rod with the telescope and sees that the rod spans 0.500 m between the marks (the stadia interval), then the horizontal distance from the instrument to the rod is: 0.500m x 100 = 50 m.
Wye level, an early optical level; Wye (rail), a term used in North American railroading equivalent to an English railway triangle; Wye fitting, used in piping and plumbing; Wye connection, used in three-phase electrical circuits; Wye interchange, or directional T interchange between two or more roads or highways
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Laser level; Laser line level; Laser rangefinder; Laser tracker; Level (optical instrument) Level staff; M. Macrometer; Map of the Duke of Noja; Marquois scales ...
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