page_title: Pumping Stations at the Nymphenburg Palace
section_title: Green Pump House
hierarchical_section_title: Pumping Stations at the Nymphenburg Palace / Green Pump House
caption_attribution_description: English: Air vessel of 1803 in the fountain house of the Nymphenburg palace garden. To the left is the outlet valve controlled by a balance weight. To the right are some of the pump plungers. Deutsch: Windkessel von 1803 im Grünen Brunnhaus des Schlossparks Nymphenburg. Links das durch ein Gewicht gesteuerte Auslassventil. Rechts einige Pumpenkolben.
context_page_description: The Pumping Stations at the Nymphenburg Palace provide water at sufficient pressure to operate the fountains in the park and in front of the Nymphenburg Palace in Munich, Germany. The original water-powered pumping stations have been in continuous operation for more than 200 years. They ranked as masterpieces at the time when they were built and are considered to be Europe's oldest machines in operation since they were built.
context_section_description: The Green Pumphouse forms part of the "Dörfchen" (petit hameau) and is situated in the park on the southern canal where a marked drop in altitude to the central area of the park allowed the installation of water wheels (48°9′19.16″N 11°29′54.19″E). It was built in 1720 by Joseph Effner for  Maximilian II Emanuel, Elector of Bavaria and contained pumps to supply water to the nearby Badenburg. In 1762, it was renewed and further little houses were added containing a forge and dwellings for the pump attendant and other servants. In 1767, Francois Poitevin installed a wooden baroque pumping station pumping water to water towers from where the fountain in the Large Parterre was operated by gravity.
  In 1803, Joseph von Baader replaced these works by more powerful and quieter pumping installations which are still operating. From the canal, small headraces feed two undershot water wheels in the central section of the Green Pump House. The smaller water wheel has a diameter of 4.70 m, a width of 1.27 m and 36 blades. The wheel is connected to a crankshaft operating the pumping works in the adjoining room. Connecting rods raise and lower three large beams (balanciers). Their other end is connected via pumping rods to six pistons moving up and down in vertical cylinders. The frame of the machine is of oak wood, the beams and rods are made of cast iron, the crank is of wrought iron. The pistons and cylinders are made of brass. The pistons are wrapped in leather envelopes for smooth running and tightening and the leather is kept wet and supple by water from separate little pipes. The pistons' stroke length is 65 cm.
  Baader placed closed cast iron pressure vessels filled with air between the pumps and the outlet pipes in order to cushion the different hydraulic pressures caused by the pumps and thus maintain a high and almost even water pressure in the cast iron duct leading to the fountain.
  The pressure vessel bears the following inscription:
  MAXIMILIANI IOSEPHI IV. ELECTORIS
   IUSSU &
  AUSPICIIS
   construxit
   IOSEPHUS BAADER
   Inventor
  
  MDCCCIII
   
  (By order and under the reign of Maximilian IV Joseph Elector of Bavaria the inventor Joseph Baader constructed (this) in 1803)
  Behind the pressure vessel, there is a pressure control valve which is controlled by an iron weight suspended from a gear rack thus making up an adjustable automatic valve.
  The pumping installation in the eastern part of the pump house is driven by the large water wheel with a diameter of 5.30 m, a width of 1.50 m  and 48 blades. Its crankshaft activates two beams and four pumps in the adjoining room. The cylinders have a diameter of 38 cm, the pistons' stroke length is 68 cm. There are two pressure vessels which also serve as support for the beams. Again, little pipes provide water for the leather envelopes of the pistons. The outlet duct with pressurized water is joined with the other duct behind the house. The installation is equipped with a manometer signed by Franz Höss, Hofbrunnen-Meister in München, 1851 (Franz Höss, royal master of pumps in Munich, 1851), one of the oldest instruments on earth  still being used.
  All pumps work are staggered in time so as to achieve a level of pressurization as even as possible. The aggregate flow rate of both installations reaches 55 liters per second.
  To a very large extent, these pumping works are still in their original configuration except for the wooden water wheels which were replaced by metal wheels in 1900.
caption: Pressure vessel in the Green Pump House with pumping rods and cylinders on the right
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