Simplex pull station at the Chicago Museum of Science and Industry. This particular pull station has been equipped with an aftermarket break-glass panel and hammer, presumably for protection against accidental and/or false alarms.
Ben Schumin is a professional photographer who captures the intricacies of daily life. This image may be used under Creative Commons Attribution-ShareAlike 2.0. Please provide artist attribution, as well as a link to the original photo and to the license terms.