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Priority to NL6514679ApriorityCriticalpatent/NL6514679A/xx
Publication of NL6514679ApublicationCriticalpatent/NL6514679A/xx
G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
G01C9/00—Measuring inclination, e.g. by clinometers, by levels
G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
G01C9/24—Measuring inclination, e.g. by clinometers, by levels by using liquids in closed containers partially filled with liquid so as to leave a gas bubble
G01C9/34—Measuring inclination, e.g. by clinometers, by levels by using liquids in closed containers partially filled with liquid so as to leave a gas bubble of the tubular type, i.e. for indicating the level in one direction only