Abstract: A construction block includes two sides connected by webs that are sized and spaced to define uniform center-to-center distances when a plurality of blocks are interconnected. The block includes webs that are offset by a specific distance both from the ends of the block and from the top and bottom edges of that block. The spacing and sizing is selected to accommodate standard lumber sizes, including 2.times.4, 2.times.6 and 2.times.8 inches. Right and left corner blocks are also disclosed and can be used in conjunction with the block to form a building wall. A cap is also disclosed. All blocks can be interconnected to superadjacent and subadjacent blocks by a special double shoulder rabbet joint connection.

Abstract: An undersea mining apparatus including a hydraulically operated ejector pump for submerged use to provide a reduced pressure adjacent the outlet of a lift pipe, to thereby induce flow of mineral nodules from the ocean floor through the pipe. The jet flow is provided by an annular jet defined between the outlet of the lift pipe and the inlet of a dredge pipe that includes a converging-diverging venturi therewithin. The venturi is movable relative to the outlet of the lift pipe to adjust the area of the annulus defined therebetween, and thereby permit variation of the rate of flow of pressurized water and of mineral nodules therethrough.