Ice cream is a ancient delicacy. The ancient Greeks, Romans and other cultures. Emperor Nero of Rome, probably the most famous emperor, paid for workers to haul ice from the snowy mountains and use it to make ice cream. They would put the cream part of the ice cream in a large bottle, they then set it in a large tub and filled the tub with the ice the had hauled from the mountains, waited for it to melt then mixed the cream in the bottle around and since all that cream was right next to the super cold water it would then become the ice cream. When they were mixing the mixture of cream into ice cream the cream would stick to the sides of the bottle, which makes it so they had to stop regularly and scrape the cream off. Lots of royalty and only very rich citizens could afford ice cream because of the ice collecting and churning. The modern ice cream maker is mostly the same as the old one and the process for using is has also changed slightly since olden times. The mixer in the old design would make it so you had to stop regularly to scrape the cream off the side of the bottle, while Nancy Johnson’s modern version had a blade on the mixer that would scrape it off the side mechanically which cut both labor and costs to make ice cream. The part of the process that changed was the fact that you add salt to the ice in the tub. Adding salt to water reduces the freezing point of water to much lower then 32 degrees making the ice melt much faster and allowing the water to get very cold without freezing making it take less time to make ice cream.
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