Brief Description |
"The Conceptograph" wheel tool was used for predicting the fertile period of a woman's menstrual cycle. Made of heavy paper folded in half with a card wheel between the sides, it was held together with a metal ring. The wheel turns to reveal the dates of the menstrual cycle and the subsequent fertile period before the next cycle begins. The front of the conceptograph is printed in blue, red and green ink on a neutral background, with instructions printed in blue ink on the reverse.
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