The document discusses the history and future of deaf education and hearing aid technology. It covers major developments from the 1800s to present, including the invention of the telephone and batteries, the first commercial hearing aids in the late 1800s, improvements in amplification and miniaturization throughout the 20th century, and the introduction of digital technology in the 1990s. The future of the field remains to be seen.

2. Hearing aid That man use old hearing aid from the 1800s years ago

3. 1800s - 1900s 2 important inventions Telephone - Alexander Graham bell Battery - Thomas Eddison = +

4. 1850 - 1890s A company in America started making hearing aids

5. 1898 people could buy hearing aid but they cost $400 but.......

7. 1920s Better amplification but HUGE battery

8. These three people must carry boxes linked to hearing aid. They carried battery in 1949

9. 1952 - First small hearing aids and on/off switch - this is not one of them!!!!!!!

10. 1950s Attached to glasses ,cost $229.50 - what do you do if you don’t need glasses?

11. 1990 The first digital hearing aids were Smaller Intelligent Cuts out unwanted noise Recognises speech

12. So what now ?