U.S. Patent Specifications

A fluid‐directing blade for turbomachincs and the like, said blade having fluid‐directing faces and comprising a number of physically united laminae each having extension in the directions lengthwise of the blade and from face to face of the blade, the edges of the laminae constituting elements of the fluid directing faces of the blade, some of said laminae, constituting a first set, extending unbroken from face to face of the blade, and others of said laminae, constituting a second set, defining openings through the centres of said other laminae extending lengthwise of the blade from end to end thereof providing passages extending longitudinally of the blade from end to end thereof, the laminae of the two sets alternating chordwise of the blade.