File:Lock 73 on C and O from NPS.jpg
Lock_73_on_C_and_O_from_NPS.jpg (700 × 525 pixels, file size: 85 KB, MIME type: image/jpeg)
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DescriptionLock 73 on C and O from NPS.jpg |
English: Lock 73. (Note: Lock 74 can be seen in the distance)
Nps site says: This lock was built to 1836 specifications. It is a cut limestone lift lock similar to Locks 74 and 75. About mid way in the 4' long upper extension walls is a 3" wide, 2½" deep drop plank gate slot that terminates 3' down from the coping on the towpath side. At a similar height, the berm side widens to 10" to continue up through the coping. This was probably to aid getting the heavy, 15' drop planks in position to slide down. The upper wingwalls angle out at about 60 degrees above the end of the extension wall and continue for about 14'. The berm only turns again to run back for 6' parallel to the lock and become part of the bypass flume. The lower extension walls run for about 14', turn at about 60' to run for another 14'. The berm wing only turns again to run perpendicular to the lock; it becomes the wall that is notched to provide an exit for the bypass flume. Both sides of the canal approaching the lock have dry laid stone walls, 45' long for the berm and 100' for the towpath. A 20' long pile of stones between the lower entrance to the lock and the bypass flume exit indicate a former rock filled wood cribbage that divided the turbulent water caused by the bypass flume spill, from the quieter water that the barges needed to enter the lock. There is some post-1900 patching of concrete around the upper gate pockets. The lock is not watered, all the wood has been removed as were the iron pins at cap stones. |
Source | National Park Service: http://www.hscl.cr.nps.gov/insidenps/report.asp?STATE=&PARK=CHOH&STRUCTURE=&SORT=&RECORDNO=1088 |
Author | National Park Service, Dept of Interior, US Government |
Licensing edit
Public domainPublic domainfalsefalse |
This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 22:28, 4 June 2013 | 700 × 525 (85 KB) | Bonnachoven (talk | contribs) | {{Information |Description ={{en|1=Lock 73. Nps site says: This lock was built to 1836 specifications. It is a cut limestone lift lock similar to Locks 74 and 75. About mid way in the 4' long upper extension walls is a 3" wide, 2½" deep drop plank ... |
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Metadata
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Camera manufacturer | Panasonic |
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Camera model | DMC-TZ1 |
Exposure time | 1/160 sec (0.00625) |
F-number | f/3 |
ISO speed rating | 80 |
Date and time of data generation | 10:43, 18 March 2008 |
Lens focal length | 5.6 mm |
Author | Picasa 2.7 |
Orientation | 0 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Picasa 3.0 |
File change date and time | 10:43, 18 March 2008 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 10:43, 18 March 2008 |
Meaning of each component |
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Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | Uncalibrated |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 38 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Unique image ID | 7e1eccef4b99aa36ee843b346edd5779 |