Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

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The large fountain is exactly the same as the small unit except that the glass tubes are connected with hoses so that a larger separation of the reservoirs can be produced. This in turn gives a greater internal pressure buildup and a greater water stream height. Fluorescein is added to the water for Astronomy demo so that black lights may be used to illuminate this demo for a greater effect. NOTE Take great care with the carboys when filled with water as this makes them super fragile to bumps and scratches. 

The pseudo Hero's Fountain demo has made some obvious sacrifices for the sake of reversibility.  There are only two reservoirs instead of three.  The fountain also is not a continuous stream in this demo but rather an intermittent spurt.