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The same system was applied to the Land Rover in the 1980s when these vehicles adopted the Range Rover's coil spring suspension. In the 1990s Land Rover, in pursuit of the same blend of on- and off-road ability, developed an air suspension system that was both self-levelling and height adjustable .
RV-C was initially developed by the Recreational Vehicle Industry Association. The first formal specification was approved in 2005, and the first RV-C products were marketed at that time. The RVIA has continued to refine and expand the protocol, and in 2008 applied to ISO with the intention of opening the RV-C protocol to the world community.
Automatic level – variant of the dumpy level, that makes use of a compensator that ensures that the line of sight remains horizontal once the operator has roughly leveled the instrument. The surveyor sets the instrument up quickly and doesn't have to relevel it carefully each time he sights on a rod on another point.
Modern automatic level in use on a construction site. A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks.
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 ...
Leveling and sharpening are two functions that are automatic and exist within memory. Sharpening is usually the way people remember small details in the retelling of stories they have experienced or are retelling those stories. Leveling is when people keep out parts of stories and try to tone those stories down so that some parts are excluded ...
A surveyor's leveling instrument has a spirit level mounted on a telescope (perhaps 30 power) with cross-hairs, itself mounted on a tripod. The observer reads height values off two graduated vertical rods, one 'behind' and one 'in front', to obtain the height difference between the ground points on which the rods are resting.
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