Jack's Manual by J. A. Grohusko (1910, p.84)

0.5 limelime juice — Squeeze half of lime in glass.acid
1 pieceice base
1 portionsloe gin base
1 fillginger ale — Fill glass with ginger ale.dilution
  1. Put the ice in a highball glass, squeeze in half a lime, and add the sloe gin.
  2. Fill with ginger ale, stir, and serve.

Ice: 1 piece ice

See also: Sloe Gin High-Ball, Sloe Gin Rickey