The Perpetual Calendar, Made to Work
Among the recipes and remedies, the book prints a perpetual calendar — a table of rules for finding the weekday of any date. Here is the same promise kept by machinery: choose any month of any year.
Church & Dwight's 1915 recipe book for the great Arm & Hammer soda — which also prints a perpetual calendar, because why not.
Among the recipes and remedies, the book prints a perpetual calendar — a table of rules for finding the weekday of any date. Here is the same promise kept by machinery: choose any month of any year.