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Birth control chain

A chain of beads for calculation of fertile and infertile days based on the findings of Hermann Knaus and Kyusaku Ogino from the 1930´s.

This counting device can be used for 28-days´ cycles only. The black rubber ring is to be shifted along to the next bead each day.
30 beads of beige, red and blue colour and a black movable ring.

Inventory number: 1011
Material: plastic beads, synthetic yarn, metal clasp, rubber ring
Dimensions, in cm: 67x1,5x1,5
Date: 2003
Condition: very good
Artist: Maria Hengstberger
Donor: Maria Hengstberger