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Telescope: Photographic Zenith Tube (1955)
- http://www.royalobservatorygreenwich.org/articles.php?article=1071
- The Photographic Zenith Tube (PZT) was designed and constructed in order to improve the accuracy of time-determination. Although technically a zenith instrument, its mode of operation was more akin to that of a highly specialised transit instrument.
Photographic zenith tube - Oxford Reference
- https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100324548
- photographic zenith tube Quick Reference A telescope with its objective lens fixed pointing vertically upwards. Stars are photographed as they pass the zenith, both directly through the telescope and after their light has been reflected from a …
photographic zenith tube | instrument | Britannica
- https://www.britannica.com/science/photographic-zenith-tube
- The photographic zenith tube (PZT) is a telescope permanently mounted in a precisely vertical position. The light from a star passing almost directly overhead is refracted by the lens, reflected from the perfectly horizontal surface of a pool of mercury, and brought to a …
Photographic Zenith Tube - Boller and Chivens: A History …
- http://bollerandchivens.com/?p=844
- This structure houses the Photographic Zenith Tube, used by the US Naval Observatory to establish absolute time. It was designed by John O’Rourke of Boller and Chivens. It is a basic telescope with a four element 26 inch diameter lens cell at the top of a 15-foot high vertical structure. The roof on the structure opens to let starlight in.
Photographic zenith tube | Article about photographic …
- https://encyclopedia2.thefreedictionary.com/photographic+zenith+tube
- photographic zenith tube ( PZT) A specially designed telescope that is used for the accurate determination of time of transit of fundamental stars, so ascertaining clock error arising from the Earth's irregular rotation and Chandler wobble. It is also used to determine the zenith distance of those stars at transit.
History of Photographic Zenith Tube (PZT) - looking for …
- https://www.researchgate.net/post/History_of_Photographic_Zenith_Tube_PZT-looking_for_information
- I am doing my PhD on the scientific instruments of the Neuchâtel Observatory.In this context, I am interested in the Photographic Zenith Tube (PZT), an instrument acquired by the Observatory in...
A photographic zenith tube made in China - ScienceDirect
- https://www.sciencedirect.com/science/article/pii/0146636478900178
- A photographic zenith tube is a fairly highly automated instrument for time and latitude determinations. Under the impetus of the cultural revolution and based on a spirit of selfreliance, our country has, in a comparatively short time, successfully designed and made a PZT with some original features.
Some Advantages and Disadvantages of a Photographic …
- https://link.springer.com/chapter/10.1007/978-94-009-9368-6_12
- Abstract. The theory and instrumentation of a photographic zenith tube (PZT) have been described by various authors (Torao, 1959; Markowitz, 1960; Thomas, 1964; Schuler, 1968; Takagi, 1974). Analysis of the more recent results of the PZT’s of the U. S. Naval Observatory at Washington, D. C. and Richmond, Florida, permit the determination of ...
Photographic Zenith Tubes Observations to Improve …
- https://www.researchgate.net/publication/234419362_Photographic_Zenith_Tubes_Observations_to_Improve_HIPPARCOS_Proper_Motion_in_Declination_of_Some_Stars
- series of optical observations of these stars observed with Photographic Zenith Tubes (PZT) are used. The HIPPARCOS ESA mission (ESA 1997) was nearly 4 …
History of the USNO, 1830 to date. - CNMOC
- https://www.cnmoc.usff.navy.mil/Organization/United-States-Naval-Observatory/Frequently-Asked-Questions-about-the-USNO/Command-History-of-the-US-Naval-Observatory/
- Beginning in 1934, the Observatory determined time with a photographic zenith tube (PZT), a specialized instrument that pointed straight upward toward the …
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