Book construction

Claim 1

A BOOK COMPRISING SEPARATE TOP AND BOTTOM COVERS AND A STACK OF SHEETS BOUND THEREBETWEEN SPIRALLY BY A HELIX PASSING THROUGH A ROW OF APERTURES RUNNING ALONG THE LOWER EDGE OF SAID COVERS AND STACK, A FLAP CONNECTED TO SAID BOTTOM COVER, SAID FLAP BEING CONSTITUTED BY A BACKING PIECE HINGED TO THE UPPER EDGE OF SAID BOTTOM COVER, A MAIN PANEL HINGED TO SAID PIECE AND A FLANGE HINGED TO SAID PANEL, AND DETACHABLE MEANS TO SECURE SAID FLANGE TO SAID TOP COVER AT A FIRST POSITION EFFECTING CLOSURE OF SAID BOOK WHEREBY SAID PIECE LIES AGAINST THE UPPER EDGES OF SAID COVERS AND SAID PANEL AND FLANGE OVERLIE SAID TOP COVER, AND IN A SECOND POSITION IN WHICH SAID TOP COVER IS FOLDED UNDER SAID BOTTOM OVER AND IS SECURED THERETO TO FORM A TRIANGULAR PLATFORM FOR SAID SHEETS, SAID PANEL FORMING THE VERTICAL SIDE OF SAID TRIANGULAR PLATFORM AND BEING OF A LENGTH SMALLER THAN THAT OF SAID SHEETS, SAID SHEETS BEING PRINTED WITH A TEXT WHOSE FIRST LINE PER PAGE BEGINS ADJACENT THE EDGE OPPOSED TO THE BINDING EDGE, THE PAGINATION OF SAID SHEETS BEING SUCH THAT THE PAES RUN IN SEQUENCE ON THE TOP FACES OF THE SHEETS AND THEN CONTINUE ON THE REVERSE FACES THEREOF, WHEREBY THE BOOK IS READABLE BY FIRST SCANNING THE TOP PAGES OF THE SHEETS IN SEQUENCE AND THEN AFTER REVERSING THE PLATFORM SCANNING THE REVERSE PAGES IN SEQUENCE.