Sprengel's air pump (single form) by E. Cetti, 38 Brooke Street, Holborn, London, England, 1880-1885. Fitted with single fall with side flask near top connected by rubber tube. Used by the Normal School of Science part of thee Department of Science and Arts, South Kensington, London, later the Royal College of Science then Imperial College (see note). Sprengel's air pump (single form) by E. Cetti