Image / Rotating gap spark transmitter, c.1911

View source image on contributor's website.

Get Citation

Have a question about this item?

Contact Owner

Item information. View source record on contributor's website.

Title: Rotating gap spark transmitter, c.1911
Date Created and/or Issued: 1910-1911
Contributing Institution: History San Jose Research Library
Collection: History San Jose Online Catalog
Rights Information: Please contact the contributing institution for more information regarding the copyright status of this object.
Description: Rotating gap spark transmitter for amateur radio, c. 1911. The innovative rotation of this spark gap, used by early experimenters to transmit wireless telegraph messages, creates a distinctive tone instead of the hiss of a fixed spark gap, making it easier to hear Morse code transmissions.
Type: image
Identifier: 132122DD-9B94-4C7A-A4E0-422976899142
2003-1-456
Subject: Radio--Transmitters and transmission (LCSH)
Electric spark gaps (LCSH)
Amateur radio stations (LCSH)

About the collections in Calisphere

Learn more about the collections in Calisphere. View our statement on digital primary resources.

Copyright, permissions, and use

If you're wondering about permissions and what you can do with this item, a good starting point is the "rights information" on this page. See our terms of use for more tips.

Share your story

Has Calisphere helped you advance your research, complete a project, or find something meaningful? We'd love to hear about it; please send us a message.