File:Lock 75 C and O Canal From NPS.jpg
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Lock_75_C_and_O_Canal_From_NPS.jpg (700 × 525 pixels, file size: 77 KB, MIME type: image/jpeg)
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[edit]DescriptionLock 75 C and O Canal From NPS.jpg |
English: Lock 75, last lift lock on C and O Canal. NPS site says;
This is a standard cut stone lift lock of gray limestone with a bypass flume on the berm side. The lock was built to 1836 specifications and is typical to that standard. It is 700' above Lock 74 and is the last of the numbered lift locks on the canal. There are equally space bolts protruding above the coping that indicate that a continuous 6" wood coping had been added to deepen the canal, but no timber remains. The 4' long upper extension wall is grooved vertically midway up to receive drop planks. This lock was fitted with a drop gate atop the breast walls to replace the upper gates, but nothing remains of the gate or its operating mechanism. The upper wingwalls flare out about 60 degrees above the upper extension wall and run for about 13'. The towpath buts into the upper towpath canal wall and the berm, then returns on itself to run for 6’ parallel to the lock. This wall becomes the lock side of the bypass flume entrance. The lower extension walls run for 13' and flares out at about a 60 degree angle. The lower towpath wingwall runs for about 14½' to butt into the 100' long dry laid stone wall of the lower canal and towpath rise. The berm wing runs for 143', turns again to run perpendicular to the lock for 8'4" before butting into the 6' deep, 8' wide notch for the by-pass flume exit. After the exit, the wall returns to full height to run another 8½' into the lower canal berm bank. This last portion of wall is buttressed by a 3' thick, stepped wall, which extends down canal for 50'. A pair of good condition, creosoted, lock gates remain in a closed position in the lower lock gate pocket. The gates have lost their balance arms. The walls’ minimum clear width is 14'-5" just below the upper gate pockets. |
Source | National Park Service http://www.hscl.cr.nps.gov/insidenps/report.asp?STATE=&PARK=CHOH&STRUCTURE=&SORT=&RECORDNO=1097 |
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 | 22:24, 4 June 2013 | 700 × 525 (77 KB) | Bonnachoven (talk | contribs) | {{Information |Description ={{en|1=Lock 75, last lift lock on C and O Canal. NPS site says; This is a standard cut stone lift lock of gray limestone with a bypass flume on the berm side. The lock was built to 1836 specifications and is typical to ... |
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Camera manufacturer | Panasonic |
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Camera model | DMC-TZ1 |
Exposure time | 1/250 sec (0.004) |
F-number | f/3.1 |
ISO speed rating | 80 |
Date and time of data generation | 11:10, 18 March 2008 |
Lens focal length | 6.1 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 | 11:10, 18 March 2008 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 11:10, 18 March 2008 |
Meaning of each component |
|
Image compression mode | 2 |
APEX exposure bias | 0.33 |
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 | 41 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Unique image ID | 0c3ce0f6a6b36adca384c83014be3b8d |
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