| 主权项 |
1. A bulls eye indicator for use in measuring a two-dimensional angle of inclination of equipment, which is mounted on an underwater bed, said bulls eye indicator comprising:
a base; a transparent window sealed with respect to said base and forming a volume therebetween, said transparent window being sufficiently resistant to pressure for operating on said underwater bed; a liquid which at least substantially fills said volume between said base and said transparent window; a floating rigid ball within said volume, said floating rigid ball comprised of a solid material with an average density less than a density of said liquid positioned in said volume; a plurality of angle measurement lines formed on said transparent window, said plurality of angle measurement lines indicating said two-dimensional angle, said first angle measurement line extending through a zero angle level indication configured for measuring a first angle in a first dimension with a range of measurement extending to opposite sides of said zero angle level along said first measurement line, and a second angle measurement line also extending through said zero angle level configured for measuring a second angle in a second dimension with a range of measurement extending to opposite sides of said zero angle level along said second measurement line; whereby said floating rigid ball floats upwardly in said liquid to thereby contact said transparent window for visually indicating said two-dimensional angle. |
