Über die Häufigkeit vollkommener Zahlen
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Decatizing apparatus comprises a steaming cylinder and a suction cylinder. Respective primary backing cloths are associated with the steaming and suction cylinders to press the fabric to be treated against the cylinders, the tension of each primary backing cloth being adjustable independently of the other backing cloth. An intermediate backing cloth is interposed between each primary backing cloth and the fabric in the zone of the cylinder, and moves over the cylinder with its associated primary backing cloth without slipping. The intermediate backing cloths permit the use of high surface pressures to be applied by the primary backing cloths.
[1] Bernhard Hornfeck. Zur Dichte der Menge der vollkommenen Zahlen , 1955 .
[2] H. Kanold. Über die Verteilung der vollkommenen Zahlen und allgemeinerer Zahlenmengen , 1957 .
[3] Eine Bemerkung über die Menge der vollkommenen Zahlen , 1956 .
[4] H. Kanold. Über die Dichten der Mengen der vollkommenen und der befreundeten Zahlen , 1954 .