Abstract: A seperator, for example, for use in paper production, of the kind having a rotationally symmetrical strainer through which the suspension flows, enclosed in a housing which has an inlet for the suspension to be cleaned and outlets both for cleaned suspension and for impurities held back by the strainer, and having blades revolving in front of the strainer which are divided into part-blades along the axis of rotation, that is, by planes perpendicular to the axis of rotation, and are offset relative to each other in the circumferential direction is disclosed. Several rows of part-blades are arranged over the strainer basket, these part-blades being of such a length and staggered over the circumference in such a way that substantially at every height level, relative to the height of the strainer basket, part-blades from several rows pass by the strainer basket. A separator free of troublesome pressure pulsations is thereby provided.

Abstract: Bis-(triazinylamino)-stilbenesulphonic acids ##STR1## wherein X is optionally substituted NH.sub.2 ##STR2## Y is a radical of formula Z is --COOR.sub.4, --CO--C.sub.m H.sub.2m+1, --CN or ##STR3## R.sub.1 is H, halogen, alkyl or alkoxy, R.sub.2 is H or alkyl,R.sub.3 is H, optionally substituted alkyl, cycloalkyl or phenyl or ##STR4## R.sub.4 is optionally substituted alkyl, R.sub.3 and R.sub.6 are H, alkyl, hydroxyalkyl or form together with N a heterocyclem is a whole number from 1 to 5 andn is 1 or 2,are optical brighteners suitable for cellulosic fibres, polyamide and polyurethane fibres and paper.

Abstract: A calendar comprising a plurality of pages, a conforming ferromagnetic plate and ring fastening means located along one edge of the pages and the plate binding said pages and plate. The pages are flipped from one side of the plate to the other, and a magnetic indicator adapted to overlie the pages and be forced against the plate is provided. The pages are imprinted on one side with chronological indicia and arranged with respect to the plate so that they lie face up on one side of the plate and face down on the other side and with respect to each other in reverse order so that initially all of the printed pages lie face down and must be turned up sequentially to the latest page in chronological order.