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2. Water level (device) - Wikipedia

   en.wikipedia.org/wiki/Water_level_(device)

   A water level device showing both ends at the same height. A water level (Greek: Aλφαδολάστιχο or (υδροστάθμη) [Alfadolasticho]) is a siphon utilizing two or more parts of the liquid water surface to establish a local horizontal line or plane of reference.

3. Topographic Abney level - Wikipedia

   en.wikipedia.org/wiki/Topographic_Abney_Level

   An Abney level and clinometer is an instrument used in surveying which consists of a fixed sighting tube, a movable spirit level that is connected to a pointing arm, and a protractor scale. An internal mirror allows the user to see the bubble in the level while sighting a distant target.

4. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   The surveyor does this with the use of a bull's eye level built into the instrument mount. The surveyor looks through the eyepiece of the telescope while an assistant holds a vertical level staff which is graduated in inches or centimeters. The level staff is placed with its foot on the point for which the level measurement is required.

5. $35 million investment is coming to northwest Louisiana with ...

   www.aol.com/35-million-investment-coming...

   Global Seamless Tubes and Pipes plans a $35 million project to establish its first U.S. production facility in northwest Louisiana, Louisiana Economic Development announced Thursday.

6. Hydrographic survey - Wikipedia

   en.wikipedia.org/wiki/Hydrographic_survey

   This method revolutionized hydrographic surveying, as it allowed a quicker, less laborious, and far more complete survey of an area than did the use of lead lines and sounding poles. From a navigational safety point of view, a wire-drag survey would not miss a hazard to navigation that projected above the drag wire depth.

7. Levelling - Wikipedia

   en.wikipedia.org/wiki/Levelling

   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.

8. Old River Control Structure - Wikipedia

   en.wikipedia.org/wiki/Old_River_Control_Structure

   Concordia Parish, Louisiana is in the foreground, on the right, and Wilkinson County, Mississippi, is in the background, across the Mississippi on the left. Old River low-sill control structure discharging water into the Atchafalaya, May 2011. The Old River Control Structure is a floodgate system in a branch of the Mississippi River in central ...

9. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!