The Artistry of Mixing Drinks by Frank Meier (1936, p.56)

0.5 glassbrandy — Brandybase
0.5 glassrum — Rumbase
1 teaspoonsugar — Sugarbase
milk — Boiling Milkdilution
1 unitegg yolk — Egg Yolkother
nutmeg — Nutmegother
  1. Stir until well mixed, add boiling milk while stirring, and serve with grated nutmeg if desired.

Egg nogs, hot or cold, may be made with brandy, gin, rum, sherry, or either whiskey.