31. Conversely, Klein et al . had found no changes in joint angles when running on an incline versus level surfaces . 32. Let us assume that a ball is rolling along a flat, level surface ; a billiard table would be an ideal example. 33. Zorbing is generally performed on a gentle slope, but can also be done on a level surface , permitting more rider control. 34. Lacking any landing gear, it would have been necessary for the Snark to skid to a stop on a flat, level surface . 35. The level is placed on a flat and " roughly " level surface and the reading on the bubble tube is noted. 36. Near the midpoint is a palimpsest, or ghost-crater feature consisting of just the rim projecting up through the otherwise relatively level surface . 37. The Belmont complex is designed to sit atop a concrete podium, erected to transform the sloping construction site to a level surface . 38. The interior floor of Poisson and Poisson T has been resurfaced by basaltic lava, leaving a level surface within the inner walls. 39. They are mixed with a special latex liquid to a mortar-like consistency, then troweled on and smoothed over to create a level surface . 40. This top level surface permitted a smoother shape and protected the larger stones in the road structure from iron wheels and horse hooves.
