The Warren-Knight Double-Center Precision Theodolite (Military Specification ML-474) is designed to observe and measure angles of elevation and azimuth of pilot/weather balloons to distances of 20,000 meters or more as well as aircraft, ships and other moving objects, under conditions of good visibility. The 90 degree elbow telescope design combines a 21 power main telescope with a wide angle 4 power finder telescope, viewed through one horizontal eyepiece. This system permits superior tracking capability even when objects pass overhead. Movement of both the azimuth and elevation scales is by positive micrometer worm drive. The micrometer drums are offered in various resolutions of 6 arc minutes, 72 arc seconds and 36 arc seconds, to fit your application. The results are always accurate.

The model 20-8350 is an integral part of the precision measuring system used by the FAA for calibration of INSTRUMENT LANDING SYSTEM (ILS), MLS, VOR, TACAN, VORTAC, and other Navigational Aids. In ILS calibration, an operator tracks the "Flight Check" aircraft and adjusts the theodolite so that the image remains in the crosshairs. The theodolite azimuth and elevation readings are continuously transmitted to the aircraft receiver by a UHF telemetric unit. The received theodolite signal is processed along with the received glide slope signal in the aircraft, to yield a direct reading of the position of the ILS on-course. This information is used to adjust the angle of the ILS glide slope and localizer signal transmission. This ground-based theodolite method is the most precise and accurate calibration method available

The model 20-8500 Observation Theodolite is similar to the model 20-8403 except the the 20-8500 is designed for permanent facilities. Instead of a battery box, there is wiring that terminates in a twist-lock male cap for the illumination system of the scales and reticule for night operation. A mating connector is furnished for making a suitable length line cord for connecting to a 6.3 V power source or the W-K Pibal Tiver 22-4850. There is no magnetic compass and illumination is by 6 volt lamps.

This system was designed to allow the operator of the theodolite to continuously track a target, such as a balloon, and have azimuth and elevation readings automatically recorded. This system can be operated by one man and eliminates operator reading and recording errors. The operator can concentrate on tracking the target and does not have to stop to take readings or take time to reacquire a lost sighting. The Data Recorder can be set to take angular and time readings at various time intervals from 1 second to 99 seconds or greater if needed. The readings can be recorded on the paper tape print out or stored for downloading into a computer through an RS 232 port. The system is battery operated for ease of operation in remote locations.

This instrument is designed to provide a means to independently establish the sighting and pointing accuracy of an automatic tracking or other radar systems. This is accomplished by tracking an aircraft over the transit sight with the transit and the radar system simultaneously. The transit determines the actual fly-over path of the aircraft which is compared with the path position information provided by the radar system. If any differences appear, then the radar system is adjusted to coincide with the coordinates determined by the vertical transit. This instrument has a right angle telescope to allow the observer to track a target as it passes overhead. The telescope to allow the observer to track a target as it passes overhead. The telescope has an erect image, magnification of 8X and field of view of 8 degrees and 45 minutes. The reticle is photo etched, with divisions every 5 mils, numbered every 10 mils for a total of 70 mils on each side of center both on vertical and horizontal axis. Reticle center is coincident with instrument optical axis and azimuth axis with +/-1 mil.

Tracking, recording and calculating angular data to .01 degrees or better is a fast and accurate one-man operation with the Warren-Knight Data Recording Theodolite. Tied into your computer by RS232 or the DAC II, this system eliminates operator error by automatically recording, time, azimuth, and elevation angle information of targets on the ground, water or in flight in reference to a fixed ground position. A second theodolite can be incorporated into the system for precise measurement by triangulation. This information is used to: determine the coordinates of a structure under construction or being aligned, such as a radar dish, or provide the position of a ship for dredging operations, track weather balloons to determine wind speed and direction in the upper atmosphere, or calibrate aircraft navigational aids such as ILS, MLS, VOR and TACAN. The information can be printed out or stored and processed later if desired. Individual application software can be provided for your requirement, i.e. a wind speed and direction program.

Azimuth geometry combines with state-of-the-art electronics to establish horizontal positioning. This Model 26-2000 incorporated an electronic horizontal circle with azimuth resolution to 0.01 degrees and an accuracy of +/-.01 degrees. The theodolite featured a 30X telescope with a vertical range of 360 degrees and a 40MM objective aperture that provides a field of view of 1 degree 30' or 25 meters at 1000M. Standard reticle is an orthogonal cross-wire pattern with no stadia indicators. A cable connected electronic unit encloses all conversion electronics. FM transmitter operates in a variety of bands and has a range of six nautical miles. Various sensitivities of angle are available.

The Theodolite Automatic Tracking System was designed to provide an error-free means to track any aircraft. The system eliminates the need for an observer to manually track a target, such as an aircraft, by automatically tracking a light mounted on the target. The large scope mounted on top of the standard optical telescope, is a light sensor that picks up the strongest light source in its view and sends information to the motor drives on the instrument to maintain the light source in the center of the sensing scope. The sensing scope is mounted in alignment with the main optical telescope which is used to allow the operator to manually acquire the light source target. After the system is manually aimed at the light target the automatic tracking mode is activated. Cameras or light sensors for specific frequencies can also be integrated into the system depending upon the application.