DSC Presentation • This will talk about deaf education PAST, PRESENT AND FUTURE
Apr 24, 2015
DSC Presentation
•This will talk about deaf education PAST, PRESENT AND FUTURE
Hearing aidThat man use old hearing aid from
the 1800s years ago
1800s - 1900s
2 important inventions Telephone - Alexander Graham bell Battery - Thomas Eddison
=+
1850 - 1890sA company in America started making hearing
aids
1898
people could buy hearing aid but they cost $400 but.......
•The battery needed a table !
1920s
Better amplification but HUGE battery
These three people must carry boxes
linked to hearing aid. They carried battery
in 1949
1952 - First small hearing aids and on/off switch - this
is not one of them!!!!!!!
1950s Attached to glasses ,cost
$229.50 - what do you do if you don’t need glasses?
1990 The first digital
hearing aids were
Smaller
Intelligent Cuts out unwanted
noise Recognises speech
So what now ?