Abstract: A seal is attached to and curved around a floating roof of a storage tank for petroleum products or other liquid materials, to extend to an outer circumference at the tank wall. The curved seal is suspended at first suspension points on the seal spaced about the floating roof. These first suspension points are spaced from the mentioned outer circumference at the wall by a first distance greater than zero and from the floating roof at a second distance greater than such first distance. The curved seal is suspended at these first suspension points from a series of corresponding second suspension points spaced from the first suspension points by third distances. Each of the second suspension points is spaced from the tank wall by a fourth distance greater than zero and from a peripheral cylindrical reference surface about the floating roof by a fifth distance greater than the mentioned fourth distance.

Abstract: A structure for supporting floor-molding forms in a multi-story building, including a truss that supports the forms and four telescoping leg units with upper ends pivotally connected to the truss, for supporting the entire weight of the truss on the previously-cast floor. The leg units are pivoted and telescoped out until the lower end of each leg unit lies on an area of the floor which is adjacent to a column or load-bearing wall of the building, within the 45.degree. shear plane lying about the column or wall, so that the weight of the truss and load thereon is transferred directly to the columns or walls to thereby eliminate heavy loading of the already-formed floor.