Hermann henkel biography of nancy johnson

Ice cream is probably the most popular and widespread sweet treat in the world. But it was once an extremely exclusive goodie that only a few could afford. Ice cream for everyone has only been around since Nancy Johnson. In , she invented a device that made it relatively easy to prepare ice cream at home. She received a US patent for it - making her a pioneer not only in the history of ice cream, but in the history of technology as a whole.

Ice cream has been known as a luxurious treat for centuries - even Roman Caesars and Chinese emperors enjoyed it.

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For a long time, this was refined natural ice, i. Later, milk ice cream was developed. For this, an ice cream mixture had to be laboriously stirred by hand for hours in a double-walled container surrounded by lots of natural ice. This ice cream was sold at a very high price.

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Nancy Johnson put an end to this. Not too much is known about the inventor: She was born Nancy Maria Donaldson on 28 December probably somewhere in the state of New York, unfortunately it is not known for sure. In , she married the natural scientist Walter Rogers Johnson , who would later play a leading role in the American Association for the Advancement of Science.

The couple, who lived in Philadelphia, adopted two children. The wooden vat, which resembled a butter churn from the outside, contained a metal cylinder for the ice cream mixture. Between the cylinder and the outer wall was a mixture of salt and crushed ice.