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This drawing[1] was produced by the Midland Railway Company for the project to reconstruct Bridge SKW1/39 (which carries the railway over Long Preston Beck). It contains a wealth of information relating to the project, including:
- A schedule of dates:
- Centering commenced - Oct 12th 1911
- Centering completed - Dec 1911
- Cost of centering - £447
- Timbers under up line - Feb 25th 1912
- Timbers under down line - March 3rd 1912
- Commenced cutting out old arch - March 7th 1912
- New arch keyed in complete - May 9th 1912
- Centres lowered ½" - May 15th 1912
- Dimensions & details of the timber formwork. (This was erected on a foundation of "P.C.concrete 7 to 1" and it supported the arch during the construction process.)
- Dimensions & details of the bridge, including:
- The dimensions of the arch (span = 45' 1", width = 27' 3½')
- New Arch 6 rings (brick) covered with asphalte 1" thick
- Rise of New Arch 12' 6"
- Radius of New Arch 26' 6⅞"
- 3-0 spandrel below crown of arch [added in pencil]
- Wing wall raised
- "30,000 Red Bricks 12,000 Blue" and "Ordered all blue" [annotated in pencil]
- Timbers to be placed under Rails as determined
- Prior to the reconstruction work, the bridge had a semi-elliptical arch[2] with stone voussoirs and keystones. The replacement segmental arch has a consistent radius[3] and it was formed using six rings of blue engineering bricks that extend to the outer edges of the arch.
- Dimensions & details of the temporary (cantilevered) footbridge installed for the footpath (which provided access to the nearby gas works).
Footnotes
[1] This image is used courtesy of the Midland Railway Study Centre (MRSC), Derby (https://www.midlandrailwaystudycentre.org.uk/index.php Item reference 12354) and it is shared under the CC BY-NC-SA 4.0 license (https://creativecommons.org/licenses/by-nc/4.0/). The version used here has been edited to trim the edges, improve contrast and reduced its size. The original digital file can be downloaded from the MRSC's online catalogue by using the link & reference number already provided.
[2] The radius of curvature and centre points vary across the span of the arch.
[3] The centre point and radius of curvature are consistent throughout the arch.