This is the Williamsons, setting off for a picnic. This photo was probably taken somewhere in the Louth area, and it looks as if it must have been a grand day out for all concerned.
Really detailed family information in from jennigal923 who says:
"William Tempest's wife Jane Emily Backhouse, had a sister Alice Gertrude Backhouse. She married Hewston Maxwell Williamson. Since this picture is in the Tempest collection, I would assume that this is a combined family picnic, hosted by the Williamson family. Hewston Maxwell Williamson seems to have been a been a merchant in Dundalk (his father was Thomas Williamson, Timber Merchant)"
NLI Ref.: TEM 70