Ilja jalkanen 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.

Endometriosis is a chronic inflammatory condition

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.

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. 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.

As salt lowers the melting point of liquids, it caused the ice to melt, but at the same time lowered the temperature to below freezing.