Personal errors They arise mainly due to the carelessness of the surveyor. They are: Inaccurate leveling Inaccurate reading Inaccurate centering Natural errors Natural errors are occurring due to the various natural causes which affect the working of compass. Local attraction It has nothing to do with the surveyor and to minimize them, som

Static wedge wire screens They have a clear opening of 0.2 to 1.2 mm and designed for a rate of flow of 400 to 1200 L/m2 min of screen area. Large floor area should require for installation of these screens and these should be cleaned once or twice daily. Drum screens In this type the screening or straining medium is mounted on a cylinder that