Museum of Science and Industry


Stock #: 562367
Type: Postcard
Era: Chrome
City: Chicago
State: Illinois (IL)
County: Cook
Publisher: Colourpicture
Size: 3.5" x 5.5" (9 x 14 cm)

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Additional Details:
The "Vocoder" - A most important feature of Bell Telephone's "Hall of Communications" is this device, which can be used to teach speech to deaf persons. It does tricks too. Visitors are invited to participate in frequent demonstrations which turn their voices inside-out and upside-down.

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