So here are some images that came from the time when Uncle Clair was actually working in the construction industry, or when his father William Christopher did.  These are all undated and unidentified.  The size of the image are the same as all the pictures that Uncle Clair took during the First World War, so perhaps the same camera?

Uncle Clair is the man sitting in the centre of the picture.

Some kind of bracing used in a hole?

Above and below are some images I think were taken at the same time, at the same site: