English: This 1917 photograph depicted a gathering of swimmers at the Lake Calhoun public bathing beach in Minneapolis, Minnesota. This image offered a view of the pavilion and beach area. It was taken during a Minnesota Department of Health study of the public bathing areas. The descriptive information accompanying the photograph referred to a governmental publication discussing public health concerns at such public bathing venues. The specific citation was, “Whittaker, H.A., Investigation of Lake Calhoun Public Baths, Minneapolis, May to November, 1917, Journal: Lancet, February 15, 1918”. This was one of a series of instructional images used by the Minnesota Board of Health to train public health workers. The purpose of the images, and the associated training, was focused on protecting public water supplies from bacterial contamination.