Barflies and Cocktails by Harry McElhone and Wynn (1927, p.84) — Barflies 1927

1 teaspoonfulFrench vermouth — French Vermouthbase
1 glassgin — Gordon Ginbase
  1. Shake well and strain into a cocktail glass.

This matters because it preserves a very dry gin-and-vermouth miniature within the late McElhone field.

See also: Martini Cocktail, Trinity Cocktail