File:Spark-gap apparatus.png
Jump to navigation
Jump to search
Size of this preview: 593 × 599 pixels. Other resolutions: 237 × 240 pixels | 475 × 480 pixels | 760 × 768 pixels | 1,097 × 1,109 pixels.
Original file (1,097 × 1,109 pixels, file size: 1.16 MB, MIME type: image/png)
Captions
Captions
High-power spark-gap transmitter at the Navy Yard, Washington DC.
Summary[edit]
| Description |
English: High-power (15 kilowatt) spark-gap transmitter at the United States Navy Yard, Washington DC. call sign| QI from 1907 on 840 and 1125 meters, on 900 meters from 1908, call NAL from 1909. Manufactured by Massie Wireless Telegraph Company.[1] Original caption: "Figure 8. – High-power Outfit, with Rotating Spark-gap Mounted on Leyden-jar Battery Frame, and Hot-wire Current Meter Mounted on Inductance Frame. – Navy Yard, Washington, D. C." |
| Date | |
| Source | (1909) Wireless Telegraphy and Telephony Popularly Explained, Category:New York: D. Van Nostrand, p. 21 |
| Author | Walter W. Massie and Charles R. Underhill |
Licensing[edit]
|
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:01, 24 December 2019 | | 1,097 × 1,109 (1.16 MB) | Mu301 (talk | contribs) | User created page with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
