The measurements used in The Mixing Master manuscript are as follows:
Jigger = 2 oz.
Pony = 1 oz.
Barspoon = tablespoon
Long or Tom Collins Spoon = teaspoon
Small or Highball Spoon = ½ teaspoon
Inspired by an unpublished mixing guide written in 1933 by my 2x Great Uncle. Vintage cocktails, trivial tidbits & cultural ephemera from the halcyon days.