31. With " Noir, " the action unfolded across the low, horizontal plane of the garage floor. 32. Alternative terms include transverse plane and horizontal plane . 33. Hour points on the polar plane will connect to the matching point on the horizontal plane . 34. The Side-Rolls move on the horizontal plane . 35. Levels are used to describe a perfect horizontal plane that is balanced with the forces of gravity. 36. This creates a horizontal plane of weakness called a " cold joint " between the two batches. 37. If the level is accurate, it will indicate the same orientation with respect to the horizontal plane . 38. All movements of the legs shall be simultaneous and on the same horizontal plane without alternating movement. 39. In his time, the gnomon was simply a vertical pillar or rod mounted on a horizontal plane . 40. Propeller sensors make use of Cartesian coordinate system and provide orthogonal velocity components in the horizontal plane .