[Custom equal hour quadrants with calendarium for specific latitudes. Select the closest latitude from the dropdown or choose full custom for one-degree steps with custom value engraved. Please allow ~10 working days for fulfillment.]
A tool for education, makeshift navigation, and rangefinding, the double-sided Wndsn Horary Quadrant Telemeter enables you to do more than merely guessing distances. It lets you measure angular size and compute distance, height or depth of object, altitude, or elevation, it allows computation of sine, cosine, and tangent for a given angle and utilize the baked-in trigonometry to find the desired value by aligning the provided string across the various scales.
The backside features functions derived from ancient astrolabes; a degree and slope quadrant, a shadow square, as well as sine and cosine arcs and an inclinometer scale with horary lines showing the equal hours of the location the quadrant is calculated for plus a calendarium, enabling the quadrant side, which by now not only enables the user to measure the sun’s altitude on a given date but in addition, to also take the time and visualize daylight hours over the course of a year. By using our string as a plumb line, we enable multiple ways of sighting, plus we let you perform various trigonometric operations with the shadow square and sexagesimal scale, increasing the usefulness of the instrument with the list of applications topping 75 currently.
Using a Wndsn Horary Quadrant Telemeter to determine latitude (at night with Polaris), calculate declination of the day with the respective arc, and a measurement of the Sun altitude (via backsighting), one can derive at least 18 data points and in fact calculate all of them directly on the device.
The best tool is the one you have with you, on you. Wndsn Telemeters are wallet-size distance and altitude nomographs developed in our applied science lab: Wndsn Telemeters combine a thousand years of civil engineering, surveying, navigation, and astronomy in one durable, low tech, high utility instrument that can be brought anywhere, is self-containing, and independent of external, modern technologies. Wndsn Telemeters are naked-eye tools that offer various means of measuring angular size, as well as graphical computers providing functions to process or convert the measured values. Their purpose is to help you navigate using known landmarks or astronomical features, to get a "second opinion" to cross-check values obtained with different means, or in emergency situations when other methods fail or are unavailable.
Made in Germany. Our instruments are engraved to the highest precision of tools and materials with every scale mark optimized for the size of the instrument based on in-house computer-calculated tables from historical and contemporary mathematical formulas.
Wndsn Custom Latitude Horary Quadrant Telemeter, double-sided
Dyneema string, 0.35 mm turquoise, pre-configured in the required length
Plumb line weight, tungsten carbide
Wndsn Quadrant morale patch; turquoise & white on black
Printed 32-page Telemeter pocketbook (in English and German)
Digital 240-page full manual (in English, German on request)