Rock became the Director of the Free Hospital for Women’s Sterility Clinic in 1926. At the Free Hospital, Rock saw many infertile women who were eager to have children. Some of his patients, however, sought the means to control conception. For these women, Rock offered the only legal contraceptive approach, the rhythm method. In 1936 he founded a Rhythm Clinic, helping women to estimate their likelihood of fertility based on a record of the length of previous menstrual cycles. A Rhythmeter, used to help a woman determine her fertile period using information such as the date of her last menses and the length of her typical cycle
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