January 2015, the Architectural Conservation Laboratory conducted a
site visit in order to conduct preliminary investigations to aid in
subsequent analyses and assessment. During this trip, high-resolution
photographs of the façade were taken in order to create an
ortho-rectified photomontage as a base image for future inspection.
This was done by using a DSLR camera to photograph portions of the
façade’s surface to then digitally stitch the images to fit previous
photogrammetric measurements as recorded during the Historic American
Buildings Survey conducted in 1975 by Perry, Myra, and Christina
Borchers at Ohio State University. |
|In addition to
preliminary documentation, original surface finishes and subsequent
repair campaigns were analyzed in-situ and small samples were taken for
further laboratory analysis. Historic images informed sampling strategy
and all sample locations were carefully photographed and notated.
Samples of finish coatings were also taken from previously fallen
fragments that had been collected by NPS staff.
|Above: The completed rectified montage.||
|Using high-resolution photography to create an ortho-rectified photomontage.|
|Taking small samples of repair campaigns for further analysis|
|Right: Working from the historic watercolor rendering helps inform decisions about where to sample.|