Abstract: A kit is described for manufacturing books along with a method of manufacturing a book. Two distinct stiffening faces are provided against an adhesive sheet surface so that a first side of each the two stiffening faces is secured to the adhesive sheet surface with borders of the sheet surface extend beyond all edges of the two faces. A distinct stiffening spine is also placed on the adhesive sheet surface between adjacent edges of the of the two faces so that the spine is secured to the adhesive sheet surface with borders of the adhesive sheet surface at a top and a bottom of the spine extend beyond the top and bottom of the spine. The borders are folded at the top and bottom of the spine and around all edges of the faces to secure the cover to the faces and the spine, with cover material forming a border around three edges of each face. Pages are secured together, the pages having surface dimensions smaller than surface dimensions of the faces and the secured pages are further secured between the faces.

Abstract: A long-life, stacked pole-piece magnetic fluid seal for sealing between a housing and magnetically permeable shaft, in one embodiment is comprised of an annular magnet, having poles of opposite polarity on first and second end surfaces thereof, an annular, magnetically permeable primary pole-piece axially abutting the first end surface of the magnet, and one or more annular, magnetically permeable secondary pole-pieces stacked axially adjacent the primary pole-piece and separated therefrom and from each other by one or more annular spacers which define intermediate spaces between the pole-pieces. The pole-pieces are in a closely-spaced, non-contacting relationship with the shaft to define one or more radial gaps which, in conjunction with the intermediate spaces collectively form an annular ring in which a magnetic fluid is disposed and retained. In a second embodiment, the annular magnet is separated from the primary pole piece by a spacer which defines an intermediate space therebetween.

Abstract: In a ferrofluid seal which comprises a magnet and at least one pole piece, the pole piece is fabricated from a ferromagnetic material which directly bonds to the magnet face. Since the pole piece material directly bonds to the magnet, no additional adhesive is necessary. Thus, the conventional steps of applying an adhesive and mounting pole pieces on the magnet are eliminated. In addition, voids and bubbles in the adhesive are eliminated, thus, enhancing seal integrity.In one embodiment, the ferromagnetic material is a ferromagnetic epoxy compound comprising a mixture of conventional epoxy materials plus a fine powder of ferromagnetic material such as iron, cobalt, nickel or various metal alloys.