## Wndsn Quadrant Telemeter: The Quadrant Side

The Quadrant side hosts an angular quadrant, an inclinometer, a shadow square, and trigonometric arcs.

## What is a Quadrant?

A quadrant is a scientific instrument that is used to measure angles up to 90°. Versions of this device can be used to calculate readings essential for navigation, such as longitude, latitude, and time of day. An object is observed through the sights, and the weighted line indicates the altitude above the horizon in degrees, along the curved scale. It was originally proposed by the Greco-Roman mathematician Ptolemy as an improvement on the astrolabe. Over centuries, medieval astronomers developed ever more accurate and useful quadrants, to meet the needs of explorers and navigators.

Additional elements on the Wndsn naked-eye Quadrant Telemeter (7x7x500 q90i30) come from the sine quadrant, the main scale of our quadrant contains a shadow square, which can be used for making trigonometric calculations and taking basic surveying measurements.

## What is an Inclinometer?

A clinometer or inclinometer is an instrument for measuring angles of slope (or tilt), elevation or depression of an object with respect to gravity. It is also known as a gradient meter, or gradiometer, declinometer, and pitch & roll indicator. Clinometers measure both inclines (positive slopes, as seen by an observer looking upwards) and declines (negative slopes, as seen by an observer looking downward) using different units of measure: degrees and percent. Astrolabes and quadrants are inclinometers that were used for navigation and locating astronomical objects, from ancient times to the Renaissance.

### Measuring angles

The most basic function of the quadrant, common to all such instruments, is measuring angles. By using the sights in combination with the weighted string, and the angle scale, a user can determine a vertical angle with a good amount of accuracy. The wallet-size Quadrant Telemeter is the tool you have on you, at all times and its precision is optimized for its size.