Zeiss Elta Total Station

Background
Description
Photos
Patents
Related
References
Links

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Background

In the September 1980 issue of the Hewlett-Packard Journal the lead article was "A Fully Integrated, Microprocessor-Controlled Total Station" (HP 3820A).  In order to make this product precision timing as well as low cost micro controller technology was needed.

Description

Photos

Fig 1	Fig 2

Patents

Zeiss Theodolite patents

2552893Theodolite scale reading system, Conway D Hillman, Allister L Baker, 1950-06-08 -
2837956 Theodolite having scale reading means,  Schneider Wilhelm, Carl Zeiss AG, 1954-07-26 - improved reading of vertical angle bubble
2837956 Theodolite having scale reading means, Schneider Wilhelm, Carl Zeiss AG, 1954-07-26 -
2911877 Geodetical instruments, Drodofsky Martin, Carl Zeiss AG, 1957-02-08 -

HP Total Station & related Patents

3619058 Distance Measuring Apparatus, William R. Hewlett and Gregory Justice, Nov. 9, 1971, -
3900259 Time Interval Phase Detection in Distance Measuring Apparatus, Claude M. Mott and Richard J. Clark, Aug. 19, 1975
4335306 Surveying instrument, HP Inc, 1979-10-29, - HP 3820A total station
4789874 Single channel encoder system, Mark W. Majette, William J. Walsh, John A. Wickeraad, 1987-07-23, -
5774074 Multi-track position encoder system, Eugene A. Cooper, Steven B. Elgee, HP Inc, 1997-01-21, - 2-track angle encoder for printer platens
PS at one time HP/Agilent made a very precise absolute angle encoder, but the above 2 patents are not for what I was looking for.

Related

References

Smithsonian National Museum of American History: "ZEISS Elta 46 West Germany 154655" (photo), 

Links

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