First Method of Refrigeration

1
First Method of Refrigeration

• Mr. Doyle
• April, 2005

2
Background Information

• William Cullen
• University of Glasgow in 1748.
• No practical purpose

3
Problem Solved

• Ice And Snow used to keep food from spoiling
• Salting
• Smoking
• Cellars

4
How the invention worked

• Cullen let ethyl ether boil into a partial vacuum
  
• Today, ammonia is turned from a liquid into a gas
  by compressing it.
• It absorbs heat in process.
• Cools by removing heat.

5
What was the importance of the invention?

• Reduced spoilage of meat
• Led to growth of meat packing and beer industries

6
Effect on Daily Life

• Meat Consumption has increased
• Heart Disease has increased