Patent ID: 6792382
Filing Date: 2004-09-14
Classification: G01C

Abstract:
A spirit level comprising:a first inclination sensor to sense inclination in two directions; at least one second inclination sensor to sense inclination in two directions; a processing and display unit to: display the inclination at the first sensor, while the first sensor is being leveled; and after the first sensor has been leveled, display an inclination related to the second sensor such that if the inclination at the first sensor has changed less than a predetermined amount since the first sensor was leveled, then an actual inclination at the second sensor is displayed, and if the inclination at the first sensor has changed more than the predetermined amount since the first sensor was leveled, then a corrected inclination at the second sensor is displayed, the corrected inclination being based on the inclination at both the first and second sensors; and communication links connecting the first and second sensors to the processing and display unit to allow the first and a second sensors to move with respect to each other and with respect to the processing and display unit.