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The Zeiss Telescopes - History and Research

The History

According to John Anson Ford, the genesis of Griffith Observatory and its public telescope occurred when Col. Griffith J. Griffith (1850-1919) paid a visit to the Mt. Wilson Observatory, then home of the world's largest operating telescope, the 60-inch reflector. There he was given the opportunity to view a celestial wonder through the telescope, and was profoundly moved by the experience. "Man's sense of values ought to be revised," Ford quotes Griffith as saying. "If all mankind could look through that telescope, it would revolutionize the world".

After consulting many experts on astronomy and public education, (including George Ellery Hale, founder of the Yerkes and Mt. Wilson Observatories), he established a trust fund with the goal of eventually building an Observatory that would contain solar and celestial telescopes, a scientific theater, and a museum (the "Hall of Science") to illustrate the place of humanity in the vastness of space and time. For celestial viewing, he specified in his will that the telescope was to be "at least 12-inches in diameter" and "complete in all its details" and was to be located "high and above the Hall of Science".

Following Griffith's death in 1919, plans for the observatory and Hall of Science were delayed until the Griffith Trust committee determined that its fund had grown sufficiently to carry out Griffith's will. In 1930 the trust committee appealed for help in realizing Griffith's plans to Walter Adams, Director of the Mt. Wilson Observatory, and to George Ellery Hale, who was in the midst of directing the planning of a 200-inch telescope (eventually completed in 1948 as the Hale Telescope on Palomar Mountain).

Hale's artist, instrument designer, architectural consultant, and the figurehead of the amateur telescope making movement, Russell W. Porter, chose the 12-inch Zeiss refracting telescope as being the best available for fulfilling Colonel Griffith's intentions. The Griffith Trust ordered the telescope from the Carl Zeiss Company of Jena, Germany in 1931. The $14,900 spent on the instrument was the first purchase of material for the observatory.

At the Zeiss factory, the telescope was set up in a special testing room with a sliding roof for its first check out on the stars when the astronomer Walter Baade happened to visit, and he was invited to be the first to look at starlight through the lens. Following this visit, Baade would move to California and gain fame by using the giant telescopes of Mt. Wilson and Palomar Mountain to correctly gauge the distances of the galaxies. A decade after Baade's visit to Zeiss, the factory at Jena was destroyed by the Allied bombing of World War II.

Workers from Zeiss assembled the telescope in its dome at Griffith Observatory early in 1935. Opening night (May 14, 1935) at Griffith Observatory was cloudy, so the public had to wait for the first clear night, the following May 17, for a chance to look through the eyepiece. Since then the telescope has carried out Griffith's primary mission of providing views of the night sky to visitors on every clear night that the Observatory is open, amounting to more than 5 million people since the first night.

Thanks to a loan from Meade Instruments, the observatory staff is gaining experience with CCD (Charge-Coupled-Devices) to extend the uses of the Zeiss Telescope.

The Zeiss factory in Jena

The Zeiss factory in Jena, Germany ca. 1930. The building with the sliding roof (below center) is where telescopes were temporarily set up for testing on the stars. Zeiss Catalogue, Griffith Observatory Collection.

 Zeiss company install the 12-inch telescope at Griffith Observatory

Workers from the Zeiss company install the 12-inch telescope at Griffith Observatory, 1935. Austin-Chalk Collection, Griffith Observatory.

 The completed telescope as it appeared in 1935

The completed telescope as it appeared in 1935. (Security National Bank Collection/Los Angeles Public Library)

Telescope Demonstrator Glenn Miller updates the crowds assembled to see the images coming from the telescopes throughout the week of the comet collisions. Griffith Observatory photograph.

Telescope Demonstrator Glenn Miller updates the crowds assembled to see the images coming from the telescopes throughout the week of the comet collisions. Griffith Observatory photograph.

 Another view of the overflow crowds who came to watch comet-scarred Jupiter in 1994. Griffith Observatory Photograph

Another view of the overflow crowds who came to watch comet-scarred Jupiter in 1994. Griffith Observatory Photograph

 Camera used for Griffith Observatory's flare star patrol. Griffith Observatory Photograph.

Camera used for Griffith Observatory's flare star patrol. Griffith Observatory Photograph.

Research

Volunteer Ernie Williams operates a CCD camera and video camera mounted to the telescopes to provide live images of Jupiter during the impacts of the fragmented Shoemaker-Levy 9 in July, 1994. Griffith Observatory photograph.

Although the 12-inch Zeiss Refractor is a telescope of professional quality, it is small by professional standards. The length of its tube is the same as the width of the 200-inch (5 meter) mirror of the Hale Telescope at Palomar! It was chosen because, for visual use, it provides about as sharp a view as is possible from the earth's surface when used on the bright objects appropriate for public viewing.

The urban location of the telescope convinced Walter Adams, director of the Mt. Wilson Observatory in the 1930s, that the surrounding lights of Los Angeles would keep the 12-inch from ever doing useful research.

This opinion, however, did not long deter Griffith's staff from trying! In 1940, two young staff members, George Herbig (later to go on to become an expert on young stellar systems at Lick Observatory and the University of Hawaii) and George Bunton (subsequently the Manager of the Morrison and Bishop Planetariums), designed a planetary camera which demonstrated that the telescope was excellent for photographing the moon and planets, eventually making Griffith Observatory the source for many illustrations used in astronomy texts and newspapers.

Staff astronomer Paul Roques developed a research program to study flare stars, faint red stars that undergo dramatic, sudden, and outbursts in brightness for a few minutes before settling down. Using light-amplifying equipment that became available after World War II, Roques carried out a research program between 1952 and 1969 that netted the first record of the complete cycle of a flare star outburst, tracing the stages of the event on a chart recorder. Roques also monitored and searched for flare stars photographically with an automatic system between 1960 and 1971.

The addition of a 9½-inch Zeiss telescope in 1955, previously mounted for more than two decades on the roof of the car of Whittier amateur astronomer Shelly Stoody, aided Roques in the precise aiming and guiding needed for his photoelectric work.

Sometimes Roques would be joined by volunteer assistants, and several times in the 1950s the telescope was used by the cosmologist Fritz Zwicky (discoverer of dark matter, neutron stars, and -- with Walter Baade -- of supernovae).

On special occasions since 1951, successive generations of television cameras have been attached to the 12-inch or 9½-inch telescopes to send images to TV stations for broadcast or to monitors within the building, or to project onto the dome of the planetarium. The current camera allowed tens of thousands of visitors to view live images of Jupiter on monitors set up around the Observatory during the week that it was impacted by comet Shoemaker-Levy 9 in July, 1994.

Local television station KTTV broadcasts the moon on August 15, 1951. Griffith Observatory Photo.

 

Shelly Stoody of Whittier, California and his mobile 9½-inch Zeiss Refractor in 1933. (Security Pacific National Bank Photograph Collection/Los Angeles Public Library).

 

Paul Roques with the photometer, 1955. The 9½-inch refractor had just been mounted piggyback onto the 12-inch to assist Paul's research program. Griffith Observatory Photograph.