Alexander Graham Bell

Alexander Graham Bell was a British inventor scientist. that helped the development of communications and technology. His father, grandfather and brother were working with speech and speech which helped deeply in the work of Bell his research in listening. Empesara this what motivated him that work with hearing aids or ear imbestigaciones helped her to get started to work on the phone.

inventions

Phone Graham Bell

Alexander Graham Bell built this prototype phone in 1875. The apparatus consisted of a coil, a magnetic arm and a tensioned membrane

Audiometer

Audiometer. It is an instrument of digital technology and ultra compact design allows tonal audiometry by air and bone conduction microphone or recorder logoaudiometrías.

Used for complete and specific audiometric test. Hearing to determine the level of a patient in each of his ears.

wax cylinder

The wax cylinders were small parts used in phonographs containing sound recordings that were placed in rows on the outside thereof.

These slightly soft wax cylinders were often wear reproductions after ten