Perpetual calendar, English, 1822-1869.
3 1 c m
actual image size: 32cm x 23cm

Perpetual calendar, English, 1822-1869.

© Science Museum / Science & Society Picture Library


This calendar was designed for calculating the time of parturition (childbirth) and is made out of wood and ivory. The outer wheel is divided into four parts labelled: Conception, Quickening, Foetus Viable, and Parturition. It was manufactured by Ferguson at St Bartholomew's Hospital, London.

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