![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](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5MzcvMDEvMDEvbmV3LWZhdGhvbWV0ZXItdXNlZC1hdC1mdWxsLXNwZWVkLXdhc2hpbmd0b24tZGMtbWF5LTctZHItaGVyYmVydC1ncm92ZS1kb3JzZXktMTAyNC5qcGc%3D/40/50/webp "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")
New fathometer used at full speed. Washington, D.C., May 7. Dr. Herber...
Public domain photograph of people in office, interior, the 1910s-1920s America, free to use, no copyright restrictions image - Picryl description
Plastic tableware for the Navy. Plastic bowls that will be used for Na...
Picryl description: Public domain image of a worker, labor, factory, plant, manufacture, industrial facility, 1930s, mid-20th-century industrial photo, free to use, no copyright restrictions.
Coat Corp. of America. Shipping department, flash
Picryl description: Public domain image of an industrial building, factory, workshop, workers, 19th-20th century, free to use, no copyright restrictions.
A dark foreshading - on a flash picture, "Take us smilin' or we'll lay...
A man sitting for a portrait with his pet bulldog seated on a chair next to him, both scowling at the camera on the right. Currier & Ives : a catalogue raisonné / compiled by Gale Research. Detroit, MI : Gale R... More
![[Actually, it was no more than a moment or two before the prisoner found reply, but it was long enough for his tortured eye to flash inward and backward with terrible focus]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5MjEvMDEvMDEvYWN0dWFsbHktaXQtd2FzLW5vLW1vcmUtdGhhbi1hLW1vbWVudC1vci10d28tYmVmb3JlLXRoZS1wcmlzb25lci1mb3VuZC1yZXBseS02NDAuanBn/40/49/webp "[Actually, it was no more than a moment or two before the prisoner found reply, but it was long enough for his tortured eye to flash inward and backward with terrible focus]")
[Actually, it was no more than a moment or two before the prisoner fou...
Title from mat. (DLC/PP-1935:0006). Forms part of: Cabinet of American illustration (Library of Congress). Published in: "Guilty" by Fannie Hurst, Cosmopolitan, 70:15 (Feb. 1921).
![Arab gathering with P.I.O. [i.e., Public Information Office] & postal officials at Y.M.C.A. on Oct. 13 '41. Flash groups at tables](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTUvMTEvMjUvYXJhYi1nYXRoZXJpbmctd2l0aC1waW8taWUtcHVibGljLWluZm9ybWF0aW9uLW9mZmljZS1hbmQtcG9zdGFsLW9mZmljaWFscy1hdC0xMDI0LmpwZw%3D%3D/40/29/webp "Arab gathering with P.I.O. [i.e., Public Information Office] & postal officials at Y.M.C.A. on Oct. 13 '41. Flash groups at tables")
Arab gathering with P.I.O. [i.e., Public Information Office] & postal ...
Public domain photograph of meeting, discussion, group of people, political event, free to use, no copyright restrictions image - Picryl description
New fathometer used at full speed. Washington, D.C., May 7. Dr. Herber...
A black and white photo of a man in a room, Library of Congress Harris and Ewing collection Title from unverified data received with the Harris & Ewing Collection on the negative or negative sleeve. Gift; Harr... More
![Trial flash picture of Holy Sepulchre with Archi[mandrite] Kiriako, Perry-Robinson, close up, Archi[mandrite], Kiriako, Perry Robinson, Mantura & one priest](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5NDEvMDEvMDEvdHJpYWwtZmxhc2gtcGljdHVyZS1vZi1ob2x5LXNlcHVsY2hyZS13aXRoLWFyY2hpbWFuZHJpdGUta2lyaWFrby1wZXJyeS1yb2JpbnNvbi0xLTEwMjQuanBn/40/28/webp "Trial flash picture of Holy Sepulchre with Archi[mandrite] Kiriako, Perry-Robinson, close up, Archi[mandrite], Kiriako, Perry Robinson, Mantura & one priest")
Trial flash picture of Holy Sepulchre with Archi[mandrite] Kiriako, Pe...
Public domain photograph, 1930s-1940s Jerusalem, Palestine, History of Israel, free to use, no copyright restrictions image - Picryl description
A dark foreshading - on a flash picture, "Take us smilin' or we'll lay...
A man sitting for a portrait with his pet bulldog seated on a chair next to him, both scowling at the camera on the right. 39507 U.S. Copyright Office. Currier & Ives : a catalogue raisonné / compiled by Gale R... More
Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patro...
Picryl description: Public domain image of a boat in a harbor, water, fishing boat, free to use, no copyright restrictions.
Into the open. Harry F. Sinclair, millionaire oil magnate faced a batt...
A black and white photo of a man in a suit and hat. Public domain portrait photograph, free to use, no copyright restrictions image - Picryl description
J.J. Archbold, 2830 Sunset Ave., Sunset Island, no. 1, Miami Beach, Fl...
Public domain photograph - American industrial history, 1930s-1940s, free to use, no copyright restrictions image - Picryl description
Flash light photo of John Sousa, his mother and some brothers and sist...
Public domain photograph of military personnel, army, militia, infantry, free to use, no copyright restrictions image - Picryl description
![Flash pictures New Year's Eve to Mr. Tweedy's staff by Turkish, Tweedy & Turkish Consul Gen[eral]. Large group (left-section) front row seated](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5NDEvMDEvMDEvZmxhc2gtcGljdHVyZXMtbmV3LXllYXJzLWV2ZS10by1tci10d2VlZHlzLXN0YWZmLWJ5LXR1cmtpc2gtdHdlZWR5LWFuZC10dXJraXNoLTEwMjQuanBn/40/28/webp "Flash pictures New Year's Eve to Mr. Tweedy's staff by Turkish, Tweedy & Turkish Consul Gen[eral]. Large group (left-section) front row seated")
Conversion. Army truck parts. An electric flash welding machine sendin...
Public domain photograph related to Great Depression, free to use, no copyright restrictions image - Picryl description
![Flash pictures New Year's Eve to Mr. Tweedy's staff by Turkish, Tweedy & Turkish Consul Gen[eral]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5NDEvMDEvMDEvZmxhc2gtcGljdHVyZXMtbmV3LXllYXJzLWV2ZS10by1tci10d2VlZHlzLXN0YWZmLWJ5LXR1cmtpc2gtdHdlZWR5LWFuZC10dXJraXNoLTItMTAyNC5qcGc%3D/40/29/webp "Flash pictures New Year's Eve to Mr. Tweedy's staff by Turkish, Tweedy & Turkish Consul Gen[eral]")
FORT MYER. SHEPHERD, WILLIAM H., 2ND LT., U.S.A., 3RD FIELD ART. ON 'F...
Picryl description: Public domain image of military training, armed forces fort, camp, exercise activity, free to use, no copyright restrictions.
![Flash pictures New Year's Eve to Mr. Tweedy's staff by Turkish, Tweedy & Turkish Consul Gen[eral]. Large group (all standing) front row seated](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5NDEvMDEvMDEvZmxhc2gtcGljdHVyZXMtbmV3LXllYXJzLWV2ZS10by1tci10d2VlZHlzLXN0YWZmLWJ5LXR1cmtpc2gtdHdlZWR5LWFuZC10dXJraXNoLTMtMTAyNC5qcGc%3D/40/28/webp "Flash pictures New Year's Eve to Mr. Tweedy's staff by Turkish, Tweedy & Turkish Consul Gen[eral]. Large group (all standing) front row seated")
Sheep fold cave. Flash at Beit Sahurr. Shepherds' Fields.
Public domain image of cattle, livestock, farm animals, agriculture, free to use, no copyright restrictions - Picryl description
Trial flash picture of Holy Sepulchre with Archimandrite Kiriako, Perr...
Public domain photograph, 1930s-1940s Jerusalem, Palestine, History of Israel, free to use, no copyright restrictions image - Picryl description
An Instantaneous flash picture of the Chicago Board of Trade in sessio...
D10743 U.S. Copyright Office Copyright deposit; Geo. R. Lawrence; May 24, 1900. Copyright claimant's address: 2701 Indiana Ave., Chicago.
An Instantaneous flash picture of the Chicago Board of Trade in sessio...
D10743 U.S. Copyright Office Copyright deposit; Geo. R. Lawrence; May 24, 1900. Copyright claimant's address: 2701 Indiana Ave., Chicago.
Flash of lightning; Galop - Public domain American sheet music, 1884
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
![Arab gathering with P.I.O. [i.e., Public Information Office] & postal officials at Y.M.C.A. on Oct. 13 '41. Flash groups at tables](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTUvMTEvMjUvYXJhYi1nYXRoZXJpbmctd2l0aC1waW8taWUtcHVibGljLWluZm9ybWF0aW9uLW9mZmljZS1hbmQtcG9zdGFsLW9mZmljaWFscy1hdC0xLTEwMjQuanBn/40/28/webp "Arab gathering with P.I.O. [i.e., Public Information Office] & postal officials at Y.M.C.A. on Oct. 13 '41. Flash groups at tables")
Arab gathering with P.I.O. [i.e., Public Information Office] & postal ...
Public domain photograph of meeting, discussion, group of people, political event, free to use, no copyright restrictions image - Picryl description
Flash!, musical notation - Public domain American sheet music, 1877
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash and crash march - Public domain American sheet music, 1883
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
![Flash pictures New Year's Eve to Mr. Tweedy's staff by Turkish, Tweedy & Turkish Consul Gen[eral]. Large group (right-section) front row seated](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5NDEvMDEvMDEvZmxhc2gtcGljdHVyZXMtbmV3LXllYXJzLWV2ZS10by1tci10d2VlZHlzLXN0YWZmLWJ5LXR1cmtpc2gtdHdlZWR5LWFuZC10dXJraXNoLTEtMTAyNC5qcGc%3D/40/27/webp "Flash pictures New Year's Eve to Mr. Tweedy's staff by Turkish, Tweedy & Turkish Consul Gen[eral]. Large group (right-section) front row seated")
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash and crash march - Public domain American sheet music, 1883
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Mrs. Lawrence J. Ullman, business in Tarrytown, New York. School inter...
Picryl description: Public domain image of a classroom, college auditorium, school, students, teacher, teaching, studying, education, free to use, no copyright restrictions.
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash!, musical notation - Public domain American sheet music, 1877
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
![Arab gathering with P.I.O. [i.e., Public Information Office] & postal officials at Y.M.C.A. on Oct. 13 '41. Flash groups at tables](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTUvMTEvMjUvYXJhYi1nYXRoZXJpbmctd2l0aC1waW8taWUtcHVibGljLWluZm9ybWF0aW9uLW9mZmljZS1hbmQtcG9zdGFsLW9mZmljaWFscy1hdC0yLTEwMjQuanBn/40/28/webp "Arab gathering with P.I.O. [i.e., Public Information Office] & postal officials at Y.M.C.A. on Oct. 13 '41. Flash groups at tables")
Arab gathering with P.I.O. [i.e., Public Information Office] & postal ...
Public domain photograph, 1930s-1940s Jerusalem, Palestine, History of Israel, free to use, no copyright restrictions image - Picryl description
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash light photo of John Sousa, his mother and some brothers and sist...
Public domain photograph of military personnel, army, militia, infantry, free to use, no copyright restrictions image - Picryl description
Flash of lightning; Galop - Public domain American sheet music, 1884
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash!! Republican wins race. Frederick, Md. June 4. congressional wor...
A man sitting on a bench next to a white horse. Public domain portrait photograph, free to use, no copyright restrictions image - Picryl description
Flash of lightning; Galop - Public domain American sheet music, 1884
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning; Galop - Public domain American sheet music, 1884
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
![Arab gathering with P.I.O. [i.e., Public Information Office] & postal officials at Y.M.C.A. on Oct. 13 '41. Flash groups at tables](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTUvMTEvMjUvYXJhYi1nYXRoZXJpbmctd2l0aC1waW8taWUtcHVibGljLWluZm9ybWF0aW9uLW9mZmljZS1hbmQtcG9zdGFsLW9mZmljaWFscy1hdC0zLTEwMjQuanBn/40/28/webp "Arab gathering with P.I.O. [i.e., Public Information Office] & postal officials at Y.M.C.A. on Oct. 13 '41. Flash groups at tables")
Arab gathering with P.I.O. [i.e., Public Information Office] & postal ...
Public domain photograph, 1930s-1940s Jerusalem, Palestine, History of Israel, free to use, no copyright restrictions image - Picryl description
Bar Harbour, Maine. Civil Air Patrol base headquarters of coastal patr...
Picryl description: Public domain image of a boat in a harbor, water, fishing boat, free to use, no copyright restrictions.
Stroudsburg Hobby Group, Stroudsburg, Pennsylvania. Group at work, fla...
Picryl description: Public domain image of a factory, plant, manufacture, assembly line, industrial facility, early 20th-century industrial architecture, free to use, no copyright restrictions.
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning; Galop - Public domain American sheet music, 1884
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning; Galop - Public domain American sheet music, 1884
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash and crash march - Public domain American sheet music, 1883
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash!, musical notation - Public domain American sheet music, 1877
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash Archdeacon, 5/19/24 - Glass negative photogrpah. Public domain.
Public domain historical photo, free to use, no copyright restrictions image - Picryl description
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash!, musical notation - Public domain American sheet music, 1877
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash and crash march - Public domain American sheet music, 1883
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Bar Harbor, Maine. Civil Air Patrol base headquarters of coastal patro...
Picryl description: Public domain image of a boat in a harbor, water, fishing boat, free to use, no copyright restrictions.
Mrs. Lawrence J. Ullman, business in Tarrytown, New York. School inter...
Picryl description: Public domain image of a classroom, college auditorium, school, students, teacher, teaching, studying, education, free to use, no copyright restrictions.
Flash of lightning; Galop - Public domain American sheet music, 1884
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash of lightning - Public domain American sheet music, 1878
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash!, musical notation - Public domain American sheet music, 1877
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash!, musical notation - Public domain American sheet music, 1877
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)
Flash and crash march - Public domain American sheet music, 1883
From: Music Copyright Deposits, 1870-1885 (Microfilm M 3500) Also available through the Library of Congress Web Site as facsimile page images. (additional physical form)