The Artistry of Mixing Drinks by Frank Meier (1936, p.78)

2 teaspoonsBromo Seltzer base
water — Soda water or plain waterdilution
3 dropsaromatic spirits of ammonia — Aromatic Spirits of Ammoniaother
  1. Put Bromo Seltzer and aromatic spirits of ammonia in one tumbler, prepare a second tumbler half-filled with soda or plain water, pour quickly back and forth, and serve.