File:A Tide Formula Component Crank on Tide Predicting Machine No. 2.jpg
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Summary
DescriptionA Tide Formula Component Crank on Tide Predicting Machine No. 2.jpg |
English: A tide forumula component crank on Tide Predicting Machine No. 2, a special purpose mechanical analog computer for predicting the height and time of high and low tides. The mechanical arrangement (a slotted crank yoke) converts circular motion to a vertical motion that traces a sinusoid. The operator adjusts the position of the pin on the crank to represent a component of the tide formula at a specific coastal port before starting computations. The pin position affects the amplitude and phase of the sinusoid.The U.S. government used Tide Predicting Machine No. 2 from 1910 to 1965 to produce its tide predictions. The machine, also known as “Old Brass Brains,” uses an intricate arrangement of gears, pulleys, chains, slides, and other mechanical components to perform the computations.A person using the machine would require 2-3 days to compute a year’s tides at one location. A person performing the same calculations by hand would require hundreds of days to perform the work. The machine is 10.8 feet (3.3 m) long, 6.2 feet (1.9 m) high, and 2.0 feet (0.61 m) wide and weighs approximately 2,500 pounds (1134 kg). The operator powers the machine with a hand crank. |
Date | |
Source | Own work |
Author | Steven Fine |
Camera location | 38° 59′ 29.62″ N, 77° 01′ 46.07″ W | View this and other nearby images on: OpenStreetMap | 38.991562; -77.029463 |
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
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38°59'29.62201"N, 77°1'46.06799"W
14 March 2016
image/jpeg
ccceae7ae78556e57a53f644d37ade68d9b006dd
605,544 byte
1,367 pixel
2,048 pixel
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:11, 1 May 2016 | 2,048 × 1,367 (591 KB) | Sf9000 | User created page with UploadWizard |
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Author | 30 21:02:20 |
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Copyright holder |
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Date and time of data generation | 11:56, 14 March 2016 |
Latitude | 38° 59′ 29.62″ N |
Longitude | 77° 1′ 46.07″ W |
Altitude | 100.827 meters above sea level |
Short title |
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Image title |
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City shown | Silver Spring |
Orientation | Normal |
Horizontal resolution | 1.0306254079916 dpi |
Vertical resolution | 12,675.658333333 dpi |
File change date and time | (Macintosh) |
Exif version | 2.3 |
Date and time of digitizing | 11:56, 14 March 2016 |
GPS tag version | 0.0.2.2 |
Software used | Adobe Photoshop Lightroom 6.0 (Macintosh) |
Rating (out of 5) | 5 |
Date metadata was last modified | 17:02, 30 April 2016 |
Unique ID of original document | 073CEE412D2161076D0A61DE8F0C3DCF |
Copyright status | Copyright status not set |
Keywords |
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Province or state shown | Maryland |
Country shown | United States |
Sublocation of city shown | Downtown Silver Spring |
Code for country shown | US |
IIM version | 4 |