Sulfur emissions from liquid sulfur are reduced, or even entirely avoided by degassing the liquid sulfur at pressure in an out-of-pit vessel and by sweeping the rundown pit with a sweep gas that is non-poisonous for a hydrogenation catalyst. A first circuit domain is coupled to an interim storage device. The plurality of presentation slides are saved as HTML files to a predetermined location that is accessible by the viewer’s computer over a computer network, such as the Internet. The supply meter includes an identification mark, which is also located in the region of a guide system, namely guide rails, and which is arranged relative to the guide system such that it can be read with the image reader without changing its optical system.