Patented by Raoul Raba and copyright by Pentangle, England, 1977.
(plastic, 5.6 inches diameter by 1/8 inches thick;
front has three circles and back has Pentangle promotional graphics,
although sometimes this one was made with triangles on the back)
Three intersecting discs can rotate;
the goal is to mix up the puzzle and restore it to the original pattern.
Usually has a pattern of three circles on the back side and was made with different graphics on the front,
Concord plane (below),
Marilyn Monroe (below),
triangles containing figures.
presents a solution.
Rabal FR Patents
The Rotascope Case
The puzzle came in a 1/4 inch thick flexible plastic case with a cardboard insert to hold it.
The back of the case
describes the puzzle,
gives some solution hints,
mentions some puzzle history with regards to the
and shows copyright information.