- Lesson 171: Smallpox Vaccine
- Lesson 172: Voltaic Pile
- Lesson 173: Arc Light
- Lesson 174: Dalton’s Atomic Theory
Smallpox vaccine
Cowpox is like a weaker version of smallpox. Edward Jenner discovered the connection between smallpox and cowpox, and noticed that milkmaids, who get cowpox once, makes them immune to smallpox forever.
Voltaic Pile
Volta invented the battery after learning of Galvani and his frog legs. The voltaic pile can spread the use of electricity over a long period of time, unlike the Leyden Jar. Volta spread the word by article and other experiments (like electrolysis) became easier than with the Leyden Jar.
Arc Light
Humphrey Davy invented the arc light. The arc light uses two carbon rods with electric current flowing between. Davy’s arc light was powered by a large voltaic piles (above), but the arc light did not catch on quickly until the generator came about, for the voltaic piles costed a lot.
Dalton’s Atomic theory
John Dalton had an interest in meteorology and gases, which helped spark his atomic theory. His theory included that atoms are inseparable, and that H2O is water.