I don’t recall ever seeing a soda jerk in action, but I do remember as a young child going to a drugstore and having an ice cream soda at the store’s soda fountain. Years later, when I was in high school, I would often go to Ford Hopkin’s drugstore in downtown LaSalle, Illinois which had a luncheonette in the back.
In Ice Cream Headache, one of the characters, Ray, remembers when he was a kid and his father took him to the soda fountain. It’s a nice, nostalgic aside in the story. Readers are going to find a lot of these in this novella.