11. Tilt sensors and inclinometers generate an artificial horizon and measure angular tilt with respect to this horizon. 12. At 1030 on 13 December, the wheelhouse inclinometer in Willis registered one roll of 62 degrees. 13. A more accurate survey would make use of a tape measure and specialist surveying compasses and inclinometers . 14. Inclinometers on each side reported the angle from the horizontal, of the rail at that point.15. Astrolabes are inclinometers that were used for navigation and locating astronomical objects from ancient times to the Renaissance. 16. Outside the tower, subway contractors have planted four interconnected devices called inclinometers to monitor earth movement around Big Ben. 17. Important specifications to consider when searching for tilt sensors and inclinometers are the tilt angle range and number of axes. 18. A simple method of measurement was described by the British orthopedist Philip Willes and is performed by using an inclinometer . 19. This includes inertial measurement units, attitude and heading reference systems, digital inclinometers and guidance, navigation and control units. 20. Crossbow products include the CTXD02 digital inclinometer , VG700 vertical gyroscope and GNAV540 INS / GPS guidance, navigation and control unit.