- Telephone - He improved the telephone by adding carbon particles which allowed people to talk longer distances.
- Incandescent Lamp - He did not invent the first light bulb but did develop a carbon-thread filament that could burn steadily for more than 40 hours and was safer.
- Phonograph - First machine that recorded sound and played it back. This was his favorite invention.
- Stock Ticker - An instrument that transmitted the constantly changing stock prices.
Wednesday, August 17, 2011
Currently we are studying in Science about Thomas Edison and solar energy. Today Grace picked four of Thomas Edison's inventions to include in her science journal. I find that keeping a science journal keeps Grace interested more than just answering questions from a textbook. So far her journal is filled with illustrations, pictures, and journal entries from the summer study of hermit crabs and our new study of Thomas Edison.