Einstein Tower
Encyclopedia
Observatory
An observatory is a location used for observing terrestrial or celestial events. Astronomy, climatology/meteorology, geology, oceanography and volcanology are examples of disciplines for which observatories have been constructed...
in the Albert Einstein Science Park
Albert Einstein Science Park
The Albert Einstein Science Park is located on the hill Telegrafenberg in Potsdam, Germany. The park was named after the physicist Albert Einstein...
in Potsdam
Potsdam
Potsdam is the capital city of the German federal state of Brandenburg and part of the Berlin/Brandenburg Metropolitan Region. It is situated on the River Havel, southwest of Berlin city centre....
, Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...
built by Erich Mendelsohn
Erich Mendelsohn
Erich Mendelsohn was a Jewish German architect, known for his expressionist architecture in the 1920s, as well as for developing a dynamic functionalism in his projects for department stores and cinemas.-Early life:...
. It was built on the summit of the Potsdam Telegraphenberg to house a solar telescope
Solar telescope
A solar telescope is a special purpose telescope used to observe the Sun. Solar telescopes usually detect light with wavelengths in, or not far outside, the visible spectrum.-Professional solar telescopes:...
designed by the astronomer
Astronomer
An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...
Erwin Finlay-Freundlich
Erwin Finlay-Freundlich
Erwin Finlay-Freundlich was a German astronomer, a pupil of Felix Klein. He was born in Biebrich, Germany. Freundlich was a working associate of Albert Einstein and introduced experiments for which the general theory of relativity could be tested by astronomical observations based on the...
. The telescope supports experiments and observations to validate (or disprove) Albert Einstein
Albert Einstein
Albert Einstein was a German-born theoretical physicist who developed the theory of general relativity, effecting a revolution in physics. For this achievement, Einstein is often regarded as the father of modern physics and one of the most prolific intellects in human history...
's relativity theory. The building was first conceived around 1917, built from 1919 to 1921 after a fund-raising drive, and became operational in 1924. Although Einstein never worked there, he supported the construction and operation of the telescope. It is still a working solar observatory today as part of the Leibniz Institute for Astrophysics Potsdam
Astrophysical Institute Potsdam
Leibniz Institute for Astrophysics Potsdam is a German research institute. It is the successor of the Berlin Observatory founded in 1700 and of the Astrophysical Observatory Potsdam founded in 1874. The latter was the world's first observatory to emphasize explicitly the research area of...
. Light from the telescope is directed down through the shaft to the basement where the instruments and laboratory are located.
This was one of Mendelsohn's first major projects, completed when a young Richard Neutra
Richard Neutra
Richard Joseph Neutra is considered one of modernism's most important architects.- Biography :Neutra was born in Leopoldstadt, the 2nd district of Vienna, Austria Hungary, on April 8, 1892. He was born into both-Jewish wealthy family...
was on his staff, and his best-known building.
The exterior was originally conceived in concrete, but due to construction difficulties with the complex design and shortages from the war, much of the building was actually realized in brick, covered with stucco. Because the material was changed during construction of the building, the designs were not updated to accommodate them. This caused many problems, such as cracking and dampness. Extensive repair work had to be done only five years after the initial construction, overseen by Mendelsohn himself. Since then numerous renovations have been done periodically.
The building was heavily damaged by Allied bombing during World War II, leaving it in a state that, as the architecture blog A456 noted, was ironically more in line with Mendelsohn's conceptual sketches than the pre-war structure was. It underwent a full renovation in 1999, for its 75th anniversary, to correct problems with dampness and decay that had meant decades of repair. It is often cited as one of the few landmarks of expressionist architecture
Expressionist architecture
Expressionist architecture was an architectural movement that developed in Europe during the first decades of the 20th century in parallel with the expressionist visual and performing arts....
.
According to lore, Mendelsohn took Einstein on a long tour of the completed structure, waiting for some sign of approval. The design, while logical and perfectly sufficient to its purpose, stood out like an "ungainly spaceship" in the suburbs of Potsdam. Einstein said nothing until hours later, during a meeting with the building committee, when he whispered his one-word judgment: "Organic". (Otto Friedrich, Before the Deluge.) Mendelsohn himself said that he had designed it out of some unknown urge, letting it emerge out of "the mystique around Einstein's universe" (Wolf von Eckardt, Erich Mendelsohn.)
Equipment and Initial Research Focus
In 1911 Einstein published the initial version of his innovative General Theory of Relativity. One of the predicted effects according to the theory was a slight shift of spectral lines in the sun’s gravitation field, now known as the red shiftRed shift
-Science:* Redshift, the increase of wavelength of detected electromagnetic radiation with respect to the original wavelength of the emission* Red shift, an informal term for a bathochromic shift...
. The solar observatory in Potsdam was designed and constructed primarily to verify this phenomenon.
Mount Wilson Observatory
Mount Wilson Observatory
The Mount Wilson Observatory is an astronomical observatory in Los Angeles County, California, United States. The MWO is located on Mount Wilson, a 5,715 foot peak in the San Gabriel Mountains near Pasadena, northeast of Los Angeles...
in California, the first tower telescope worldwide, was the model for the facility designed by Freundlich. In tower telescopes a coelostat (a system with two deflecting mirrors, pronounced "seelostat") at the top of a vertical construction directs light down to an objective. The actual lens system is rigidly integrated into the construction. The mirrors at the top are movable and only these small lightweight instrument components are needed to track the sun. Because of the vertical arrangement, air turbulence near the ground has virtually no effect.
In the Einstein Tower the construction containing the optics consists of two wooden platforms, each six m high, placed one above the other. The telescope has a lens objective of 60 cm diameter and focal length of 14 m. Rooms for observations and measurements are located at the base of the tower. In California the lab rooms are under each other; in Potsdam they are arranged horizontally. Another rotating mirror directs the sunlight to the spectrograph
Spectrograph
A spectrograph is an instrument that separates an incoming wave into a frequency spectrum. There are several kinds of machines referred to as spectrographs, depending on the precise nature of the waves...
lab located in the basement behind an earthen wall on the southern side of the tower. It is about 14 m long and thermally insulated. Here is where the light is split up into its spectral components and analyzed. This design of a horizontal laboratory wing led to the elongated profile of the entire facility.
Soon after research started at the site, it became evident that the proof sought would be harder to obtain than originally anticipated since the minimal shift of spectral lines was obscured by other solar influences. The reason was atmospheric turbulence on the solar surface. However, Einstein and Freundlich had from the beginning not only been interested in the specific problem of the red shift, but had also intended basic research in solar physics
Solar physics
For the physics journal, see Solar Physics Solar physics is the study of our Sun. It is a branch of astrophysics that specializes in exploiting and explaining the detailed measurements that are possible only for our closest star...
, and the laboratories were so designed that new equipment could be installed without difficulty. The turbulent behavior of the outer solar atmosphere soon became the primary subject of research at the Einstein Tower. The red shift could be proved only in the 1950s after it became possible to precisely analyze the complex disturbances of the solar atmosphere.
Present work
The characteristics and behavior of magnetic fields provide the key to understanding solar activity and are at the focus of work at the Einstein Tower. The solar magnetic field can be measured with the help of a double spectrograph and two photoelectric polarization analyzers. Measurements in the photospherePhotosphere
The photosphere of an astronomical object is the region from which externally received light originates. The term itself is derived from Ancient Greek roots, φῶς, φωτός/phos, photos meaning "light" and σφαῖρα/sphaira meaning "sphere", in reference to the fact that it is a spheric surface perceived...
, the visible light realm, permit conclusions about the situation at higher altitude levels. The Potsdam astronomers participate in the operation of an observatory on Tenerife
Tenerife
Tenerife is the largest and most populous island of the seven Canary Islands, it is also the most populated island of Spain, with a land area of 2,034.38 km² and 906,854 inhabitants, 43% of the total population of the Canary Islands. About five million tourists visit Tenerife each year, the...
. Instruments to be used there are first developed and tested at the Einstein Tower. The Einstein Tower also plays an important role in training students.
Einstein Sculpture
In the tower’s entrance area there is a bronze bust of Einstein which was originally located in one of the rooms of the observatory. After the Nazis' anti-Semitic dictatorship began in 1933, the Einstein Tower lost its name and status as an independent institute. Pictures of Einstein were removed and sculptures were supposedly melted down. However, after 1945 it was discovered that staff members had rescued the portrait bust now to be seen at the base of the tower by hiding it behind crates in the spectrograph lab. As a hidden homage to Einstein a single stone (German: 'ein Stein') was placed where the bust had stood, a tradition that is still kept (the stone is regularly stolen though and has to be replaced).The 3 SEC Bronze Brain
A few meters in front of the stairs to the Einstein Tower and set into the pavement of the forecourt is a fist-sized art object, a bronze reproduction of a human brain highly reduced in size, its shiny surface a sign of wear, inscribed with the four characters, 3 SEC. It was created by the Berlin artist Volker März, who placed it here and in an identical form in front of the Neurological Institute of the CharitéCharité
The Charité - Universitätsmedizin Berlin is the medical school for both the Humboldt University and the Free University of Berlin. After the merger with their fourth campus in 2003, the Charité is one of the largest university hospitals in Europe....
in Berlin. The small sculpture refers to a scientific thesis of Ernst Pöppel
Ernst Poeppel
Ernst Poeppel is a German psychologist and neuroscientist who was born in 1940. He has studied psychology and biology in Freiburg and Munich, Germany, before finishing his academic education with PhD in 1968 in Innsbruck, Austria...
according to which “the experience of continuity is based on an illusion. Continuity arises through the networking of contents, which in each case are represented in a time window of three seconds. We reconstruct temporal continuity based on what is represented in the individual islands of consciousness.” (translation) Taking up this idea, März titled his work “the 3 SEC Bronze Brain – Admonition to the Now – Monument to the continuous present.” (translation).
Sources
- Paul Sigel, Silke Dähmlow, Frank Seehausen und Lucas Elmenhorst, Architekturführer Potsdam - Architectural Guide, Dietrich Reimer Verlag, Berlin 2006, ISBN 3-496-01325-7.
External links
- Detailed description
- Great Buildings page with many photos
- Sonnenobservatorium Einsteinturm (first page in German, but many pages in English with excellent illustrations and photos)
- ourbania - Einstein Tower
- Potsdam from Above — Einsteinturm
- Web site with photographs of architecture