Description and use of the Wndsn Quadrant Telemeter. Fresh from the mind of Wndsn, the 4th edition of the Official Time & Space Manual advances the body of information regarding the Wndsn suite of telemetry tools. The 4th edition enables the user to hold a complete understanding of how to independently calculate crucial measurements that we often ignore, take for granted, or assume are impossible outside of highly involved, highly technical contexts. The Wndsn Quadrant Telemeter is a low tech, naked-eye, observational instrument for measuring angles via various inputs and sighting methods. In addition, the Quadrant Telemeter is a graphical, analogue computer providing functions to directly process or convert the acquired values. The Quadrant Telemeter allows the user to measure angular size and compute distance, height or depth of object, slope, altitude, or elevation; it provides an inclinometer as well as scales for the computation of sine, cosine, and tangent for a given angle. This instrument is equally useful in altimetry, surveying, etc., for taking altitudes, and determining right-angled triangles. This manual is about the theory and practice of the instrument.This newest edition expands the modern user's understanding of astronomical systems, providing concise and tangible instruction. The 4th edition reiterates the constituent concepts of calculating distance with reworked fundamental and clarifying graphics; all previous material is included and updated, including the Time & Space addendum that previously introduced setup, history, as well as the functions and tutorials regarding understanding the ancient fundamentals behind the measurement of time and date. Efficient learning and accessible information is the overarching goal for the 4th edition. The 4th edition expands upon the 3rd edition, with 140 pages more pages, 50 new graphics, 5 new tables, and 16 new equations. The examples and tutorials utilize only the most salient formulas and only require the Quadrant for measurements and computations (plus pen and paper for note-taking). The expanded reference section is a standalone resource for emergency or austere situations. The novice, the seasoned practitioner, and the educator looking to demonstrate mathematical concepts in tangible ways are equally addressed.