Using the Sine Quadrant worksheet to find the great circle direction between two latitude-longitude pairs, we determine the difference between both latitudes and longitudes respectively, set the horizontal and vertical scales (to angle values) and read the resulting value on the degree scale. From the coordinates, we can tell where in the relevant compass quadrant (N, S, W, E) we expect to find the direction.
We graphically solve the formula:
tan q = sin delta L / sin delta phi
which has been established about a 1000 years ago. (For more, compare the printed manual.)
Wndsn Telemeters: Low tech, high utility graphical distance & altitude computers from the Wndsn applied science lab.
Wndsn Telemeters are simple observational tools for measuring angles via various inputs combined with a number of means to directly process the acquired values.
In the face of potential high-frequency disturbances, low tech becomes valuable as a backup or main tool. All the calculations, trigonometry, and maths you need - hidden in a piece of string. Our distance & altitude nomographs revive ancient technologies and unite them for the first time in low tech, high value instruments.
Our current flagship, a multitool for emergency navigation, for training and education, as a visualization tool or to get a second opinion; the Wndsn Quadrant Telemeter is a naked-eye observation powerhouse of critical functions in one durable, low tech, high utility instrument that can be brought anywhere and belongs in every instructor's and survival kit.
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