This section is from the "Henley's Twentieth Century Formulas Recipes Processes" encyclopedia, by Norman W. Henley and others.
Shaved ice..... 0.5 tumblerful
Powdered sugar 4 tablespoonfuls
Juice of....... 1 lemon
Yolk of........ 1 egg
Shake well, and add carbonated water to fill the glass.