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Summary
| Description |
English: Charles Grafton Page's double helix coil, as marketed in 1848 by Boston instrument maker Daniel Davis Jr. |
| Date | |
| Source | Daniel Davis Jr., Catalogue of Apparatus, (Boston, 1848), Fig. 183, p. 37 |
| Author | Daniel Davis Jr., |
| Permission (Reusing this file) |
before 1923 |
Licensing
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:40, 23 March 2010 | | 1,104 × 934 (244 KB) | Anemonella | {{Information |Description={{en|1=Charles Grafton Page's double helix coil, as marketed in 1848 by Boston instrument maker Daniel Davis Jr.}} |Source=Daniel Davis Jr., Catalogue of Apparatus, (Boston, 1848), Fig. 183, p. 37 |Author=Daniel Davis Jr., |Da |
File usage
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