File:Lock 69 C and O Canal from NPS.jpg
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Lock_69_C_and_O_Canal_from_NPS.jpg (700 × 525 pixels, file size: 80 KB, MIME type: image/jpeg)
This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
DescriptionLock 69 C and O Canal from NPS.jpg |
English: Lock 69. NPS site says: Lock 69 is the 11th of the 13 composite locks. These locks differ from the other locks on the canal. Between the upper end of the lower gate pockets to the lower end of the upper gate pockets the stone walls were moved 9 ¼° on each side, resulting in a clear dimension between lock walls of 16’-16 ½” rather that the 15’ previously adhered to. The normal clear dimension was resumed both up and down from these points. The walls were of rough-cut and rough-coursed limestone, principally dry-laid where the walls were widened and mortared in the other areas. The wider area was filled in with 5 ¼” square timbers. This wooden section of the lock was “water-proofed” at first by being “kyanized” and later with creosote.
Lock 69 is located a quarter of a mile below Lock #70, and two-thirds of a mile above Lock #68. The area is a fourth of a mile from the village of Oldtown, and early Maryland settlement. Start of work on the lock began in 1848 and it was finished in 1850. The wood lining of the lock was totally replaced with concrete after 1900, including the coping and much of the upper and lower extension and wingwalls. Protruding existing bolts on the towpath side indicate an added heavy wood timber to the top of the wall, probably as a tow line, but no wood remains. The lower concrete-covered lock gate pockets are 22" deep rather than the normal 16," one of the few instances in variance of this dimension. The upper lock gates remain, the towpath gate is in place, and the berm is fallen in. Much of the gate hardware is in place, although not of the original type. The wall are not nearly as plumb in the original 15' clear width is slight. The lock has been dammed with concrete at the upper ened of the upper extension wall. |
Source | National Park Service: http://www.hscl.cr.nps.gov/insidenps/report.asp?STATE=&PARK=CHOH&STRUCTURE=&SORT=&RECORDNO=1034 |
Author | National Park Service, Dept of Interior, US Government |
Licensing
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 | 22:37, 4 June 2013 | 700 × 525 (80 KB) | Bonnachoven | {{Information |Description ={{en|1=Lock 69. NPS site says: Lock 69 is the 11th of the 13 composite locks. These locks differ from the other locks on the canal. Between the upper end of the lower gate pockets to the lower end of the upper gate pocket... |
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Metadata
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Camera manufacturer | Panasonic |
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Camera model | DMC-TZ1 |
Exposure time | 1/320 sec (0.003125) |
F-number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 15:11, 14 January 2008 |
Lens focal length | 5.2 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 | 15:11, 14 January 2008 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 15:11, 14 January 2008 |
Meaning of each component |
|
Image compression mode | 2 |
Exposure bias | −0.66 |
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 | 35 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Unique image ID | 4bcfd3a83da779ca7ddd667dbb0aed1d |