Registers – Calculators – Bar
Patent
1980-12-05
1983-10-18
Fuller, Benjamin R.
Registers
Calculators
Bar
235 85FC, G06C 2700
Patent
active
044107978
ABSTRACT:
A calculation device for family planning, particulary for pre-planning the sex of a child. The device has a guide plate having a number of parallel guides arranged one above the other, and a cover plate which permits viewing of the guides. A number of slides for insertion into the guides are divided into sufficient divisions to accommodate the days of at least two successive months. An additional guide has a reference point and a window in the cover plate at a distance of fifteen such daily divisions from the reference point in the decreasing direction of the daily sequence. Two marker slides extend transversely over the guides and are slidable on the guide plate and cover plate assembly. The lower marker slide with reference to the daily sequence has two windows separated by two daily divisions and each being the width of one daily division. The upper marker slide has one window the width of one daily division. Recordal of the menstrual cycle on the device permits prediction of those times in a month when conception is likely to result in a female or alternatively a male child.
REFERENCES:
patent: 1892634 (1932-12-01), Rubinsky
patent: 2034027 (1936-03-01), Decary et al.
patent: 3486691 (1969-12-01), Rodriguez
patent: 3719806 (1973-03-01), Davidson
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