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2. Harrow (tool) - Wikipedia

   en.wikipedia.org/wiki/Harrow_(tool)

   Harrowing with tractor and disk harrow in the 1940s) Chain harrowing can be used on pasture land to spread out dung, and to break up dead material (thatch) in the sward, and similarly in sports-ground maintenance a light chain harrowing is often used to level off the ground after heavy use, to remove and smooth out boot marks and indentations ...

3. Level (optical instrument) - Wikipedia

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

   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. Levelling - Wikipedia

   en.wikipedia.org/wiki/Levelling

   Turning is a term used when referring to moving the level to take an elevation shot from a different location. To "turn" the level, one must first take a reading and record the elevation of the point the rod is located on. While the rod is being kept in exactly the same location, the level is moved to a new location where the rod is still visible.

5. Combine harvester - Wikipedia

   en.wikipedia.org/wiki/Combine_harvester

   The first leveling technology was developed by Holt Co., a US company in California, in 1891. [18] Modern leveling came into being with the invention and patent of a level sensitive mercury switch system invented by Raymond Alvah Hanson in 1946. [19] A leveling system was also developed in Europe by the Italian combine manufacturer Laverda.

6. Drawbar (haulage) - Wikipedia

   en.wikipedia.org/wiki/Drawbar_(haulage)

   A large ballast tractor pulling a load using a drawbar General duty tow hitch from VBG on a truck and a drawbar on a trailer, showing a connected drawbar eye Rockinger drawbar coupling, in which the drawbar eye gets locked. A drawbar is a solid coupling between a hauling vehicle and its hauled load. Drawbars are in common use with rail ...

7. Level staff - Wikipedia

   en.wikipedia.org/wiki/Level_staff

   When the target is set to align with the crosshairs of the instrument, the rodman records the level value. The target may have a vernier to allow fractional increments of the graduation to be read. Digital levels electronically read a bar-coded scale on the staff. These instruments usually include data recording capability.