File:Tide Predicting Machine No. 2 ("Old Brass Brains").jpg

File
File history
File usage
Metadata

Size of this preview: 503 × 600 pixels. Other resolutions: 201 × 240 pixels | 403 × 480 pixels | 644 × 768 pixels | 859 × 1,024 pixels | 1,718 × 2,048 pixels.

Original file ‎(1,718 × 2,048 pixels, file size: 739 KB, MIME type: image/jpeg)

This file is from a shared repository and may be used by other projects. Please see the file description page for further information.

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Thumbnail	Dimensions	User	Comment
current	01:11, 1 May 2016		1,718 × 2,048 (739 KB)	commons>Sf9000	User created page with UploadWizard

File usage

There are no pages that use this file.

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.

If the file has been modified from its original state, some details may not fully reflect the modified file.

Author	30 21:01:25
Copyright holder	Steven Fine
Date and time of data generation	11:38, 14 March 2016
Latitude	38° 59′ 29.62″ N
Longitude	77° 1′ 46.07″ W
Altitude	100.827 meters above sea level
Short title	Tide Predicting Machine No. 2 ("Old Brass Brains")
Image title	Tide Predicting Machine No. 2 is a special purpose mechanical analog computer for predicting the height and time of high and low tides. When the machine was routinely used, the operator would sit at the desk and turn the crank on the left, which powered the machine. Mechanical components, partially visible on the left, computed the height of tides. These were displayed on the paper tide curve visible at the top right and on the dial below the paper.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.
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	11:38, 14 March 2016
DateTimeOriginal subseconds	2
DateTimeDigitized subseconds	2
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	87BD05DF0E6975BBDE1460AEC3103D30
Copyright status	Copyright status not set
Keywords	1910 2016 Administration Atmospheric CO-OPS Center Center for Operational Oceanographic Products and Services Coast MD Maryland NOAA National Oceanic and Atmospheric Administration Oceanic Oceanographic Operational Products Services Silver Silver Spring Spring States Tide predicting machine U.S. U.S. Coast and Geodetic Survey United United States analog analog computer antique brains brass computer curve dial face geodetic high high tide historic history low low tide machine mechanical metal national ocean old old brass brains survey tide tide curve tide predicting machine no. 2
Province or state shown	Maryland
Country shown	United States
Sublocation of city shown	Downtown Silver Spring
Code for country shown	US
IIM version	4

File:Tide Predicting Machine No. 2 ("Old Brass Brains").jpg

File history

File usage

Metadata

Navigation menu

Search