File:New fathometer used at full speed. Washington, D.C., May 7. Dr. Herbert Grove Dorsey of the U.S. Coast and Geodetic Survey has invented an instrument to secure the precise measurement. The LCCN2016871649.tif
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DescriptionNew fathometer used at full speed. Washington, D.C., May 7. Dr. Herbert Grove Dorsey of the U.S. Coast and Geodetic Survey has invented an instrument to secure the precise measurement. The LCCN2016871649.tif |
English: Title: New fathometer used at full speed. Washington, D.C., May 7. Dr. Herbert Grove Dorsey of the U.S. Coast and Geodetic Survey has invented an instrument to secure the precise measurement. The machine sends a sound, pitched so high that it is above audibility, traveling thru the water a known speed, the sound hits the bottom and returns as an echo at 20 times per second. The fathometer is so accurate that a change in depth of three inches can be detected. the indications are made by a flash from a neon tube, viewed thru a rotating disc, the flash of light appearing to stand still and the depth is read as easily as a clock. The instrument indicator is installed in the pilot house (at the top of the machine) and the transceiver (the disc at the right of the machine [?]) is located in the hull of the ship, 5/7/1937
Abstract/medium: 1 negative : glass ; 4 x 5 in. or smaller |
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Source |
Library of Congress
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Author | Harris & Ewing, photographer | ||
Permission (Reusing this file) |
No known restrictions on publication. For more information, see Harris & Ewing Photographs - Rights and Restrictions Information https://www.loc.gov/rr/print/res/140_harr.html
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Collection InfoField | Harris & Ewing Collection | ||
Notes InfoField |
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Part of InfoField | harris & ewing collection · prints and photographs division | ||
Subject InfoField | united states · district of columbia · washington (d.c.) · glass negatives | ||
Location InfoField | district of columbia | ||
Place InfoField | District of Columbia--Washington (D.C.) | ||
Genre InfoField | Glass negatives |
Licensing[edit]
Public domainPublic domainfalsefalse |
This work is from the Harris & Ewing collection at the Library of Congress. According to the library, there are no known copyright restrictions on the use of this work. |
Public domainPublic domainfalsefalse |
This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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current | 14:07, 15 March 2018 | 7,993 × 10,021 (152.79 MB) | Fæ (talk | contribs) | Library of Congress Harris & Ewing Collection 1937 LCCN 2016871649 tif # 18,743 / 41,540 |
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Camera manufacturer | Sinar |
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Camera model | 54H |
Author | Library of Congress |
Width | 7,993 px |
Height | 10,021 px |
Compression scheme | Uncompressed |
Pixel composition | Black and white (Black is 0) |
Orientation | Normal |
Number of components | 1 |
Number of rows per strip | 4 |
Horizontal resolution | 1,940 dpi |
Vertical resolution | 1,940 dpi |
Data arrangement | chunky format |
Software used | Stokes Software Inc. IWS - Version 03.01.02.00 |
File change date and time | 17:25, 3 March 2009 |