Louis' Mixed Drinks with Hints for the Care & Serving of Wines by Louis Muckensturm (1906, p.73)

3 unitsegg yolk — Egg yolksbase
1 pintOld Tom gin base
0.5 pintwater — Boiling waterdilution
1 quartale — Scotch aleother
1 pinchcinnamon — Ground cinnamonother
1 pinchginger — Ground gingerother
  1. Beat the egg yolks together with the Old Tom gin.
  2. Add the ginger and cinnamon to the boiling water, stir into the eggs, add the Scotch ale, mix well, grate nutmeg on top, and serve in high-ball glasses.

Garnish: Grated nutmeg

The book says this is sufficient for four people.