Yale is orange bitters, Tom gin, Italian vermouth, and a little seltzer.
The Old Waldorf-Astoria Bar Book by Albert Stevens Crockett (1935, p.78)
| 0.5 part | gin — Tom gin | base |
| 1 dash | orange bitters | base |
| little | seltzer | dilution |
| 0.5 part | sweet vermouth — Italian vermouth | modifier |
An institution beyond Old Greenwich where many young men commuted to New York.
The Artistry of Mixing Drinks by Frank Meier (1936, p.43)
| 1 dash | Angostura bitters — Angostura Bitters | base |
| 1 glass | Old Tom gin — Old Tom Gin | base |
| Soda water — Schweppes Soda Water or Syphon | dilution |
Café Royal Cocktail Book by W. J. Tarling (1937, p.220)
| 1 piece | lemon peel | acid |
| 1 glass | gin — Dry Gin | base |
| 3 dashes | orange bitters — Orange Bitters | base |
| 1 dash | Angostura bitters — Angostura Bitters | bitter |
| Soda water — syphon | dilution |
Garnish: Add a little syphon and squeeze lemon peel on top.