Why does the use of kerosene continue to go up even as electricity use is increasing?

Mooster History's Hint:

To solve this History Mystery you will need to learn something about kerosene and its uses.

Specifically, you are looking for anything that changed from 1920 through 1960 that affected the demand for kerosene. Were there any innovations or inventions that required the use of kerosene?

You might try looking in a general reference book in your school library (in this case the Internet might not be the best source).

When you have solved the mystery, click on the "I've Solved the History Mystery" button and send in your answer. GOOD LUCK!