Red Oak framework, Aluminum crossbars, Steel pole pieces circa 1988.
Red Oak framework, Aluminum crossbars, Steel pole pieces circa 1988.
Steel pole pieces and aluminum crossbars, circa 1988.
The ribbon pleating or corrugating machine, circa 1988.
Cross-section of intended 'horseshoe' magnetic circuit, circa 1988.
Top view of proposed modification of the 'Lister' open-circuit magnetic circuit,
1998.
Detail showing beveled gap face of pole piece, reduction of 7/32" thickness
to 1/8" thickness at gap face. Note square hole in pole piece. 1998.
Additional detail of gap facing beveling of pole piece. 1998.
Detail of one of the center aluminum crossbars showing relief cutout for
anti-diffraction of ribbon backwave. 1998.
Front view of Red Oak framework showing top aluminum crossbar with old
positioning assembly for ribbon installed. 1998.
Top front view of old ribbon positioning assembly. 1998.
The second set of photos.
Ribbons - Table of Contents.
Acoustic Line Source Research - Table of Contents.
