Bartenders' Guide: How to Mix Drinks by Wehman Bros. (1912, p.68)

egg — Eggsbase
1.5 tablespoonsugar — Sugarsweetener
  1. Separate the eggs carefully, beat the whites to a stiff froth, mix in one and one-half tablespoonfuls of sugar for each egg, beat the yolks until thin as water, combine yolks with whites and sugar to a light batter, and stir occasionally to prevent separation.