Abstract: The invention is directed to a block or brick drywall construction which simulates a mortared block or brick wall construction by the use of simulated horizontal mortar layer inserts between stacked rows of blocks and vertical inserts between abutting ends of blocks in each row, the horizontal layer insert being in the form of a belt provided with longitudinally spaced holes which coincide with vertical holes Provided in the blocks and the abutment spaces between blocks, there being short pins passing through the holes of the belt layer and penetrating into the coinciding holes in the building blocks lying immediately above and below the belt, each belt layer being used in conjunction with a separate set of pins, the belt layer being substantially non-compressible whereas the vertical inserts are somewhat resilient in order to facilitate some longitudinal adjustment in the placement of blocks in abutting relationship.

Abstract: A pressure intensifier comprising a housing incorporating a first floating piston-cylinder unit with means to supply a primary pressure fluid medium to one side of the piston to apply pressure to a fluid medium in contact with the other side of the first piston, a second floating piston unit provided with a fluid medium communication port therethrough, there being direct communication between the medium contacting the other side of the first floating piston with one side of the second floating piston and through the port thereof to a fluid medium pressure power take-off chamber, the port of the second floating piston being closeable by means of a valve comprising two active parts, one part of which is incorporated in the second floating piston and the other part of which is provided with limited movement with respect thereto, there being means to apply primary fluid pressure to the other side of the said second floating piston to maintain the communication port open, the other part of the valve being constitu