The Hoffman House Bartender's Guide by Charles S. Mahoney (1905, p.141)

0.33Absinthe — Add one-third absinthe.base
ice — shaved icebase
Soda water — siphondilution
0.67vermouth — Vermouthmodifier
  1. Shake the absinthe and Vermouth with a mixing glass full of shaved ice.
  2. Serve in a Delmonico glass, using siphon.

Ice: Shaved ice

The source's siphon instruction is part of the service identity.

See also: Morning Reviver, Bracer