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Summary
DescriptionLooking into the Top of Tide Predicting Machine No. 2.jpg |
English: These components perform key computations for Tide Predicting Machine No. 2, a special purpose mechanical analog computer for predicting the height and time of high and low tides. The tide prediction formula implemented by the machine includes the addition of a series of cosine terms. The triangular metal pieces are part of slotted yoke cranks which convert circular motion to a vertical motion that traces a sinusoid. Each slotted yoke crank is connected by a shaft to a pulley, which causes the pulley to follow the sinusoidal motion. A chain going over and under pulleys sums each of their deflections to compute the tide. Along the top of the photo, connecting shafts drive slotted yoke cranks on both sides of the machine.The U.S. government used Tide Predicting Machine No. 2 from 1910 to 1965 to predict tides for ports around the world. 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 | ![]() |
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38°59'29.62201"N, 77°1'46.06799"W
14 March 2016
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current | 01:11, 1 May 2016 | ![]() | 2,048 × 1,367 (601 KB) | Sf9000 | User created page with UploadWizard |
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Author | 30 21:01:52 |
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Copyright holder |
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Date and time of data generation | 11:54, 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 | 0.29346002912116 dpi |
Vertical resolution | 49.5125 dpi |
File change date and time | (Macintosh) |
Exif version | 2.3 |
Date and time of digitizing | 11:54, 14 March 2016 |
DateTimeOriginal subseconds | 7 |
DateTimeDigitized subseconds | 7 |
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 | 17:01, 30 April 2016 |
Unique ID of original document | 65C82A3C148F789F27FB97492B624A54 |
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 |