Looking for the Wndsn store? This way, please.

398 pages, black & white. 129 graphics, 22 tables. Perfect bound. 8" x 5" (20.5 x 13.5 cm)

## Contents

• Preface to the 4th Edition
• Preface to the 3rd Edition
• Overview
• What is a Telemeter?
• Why Low Tech?
• Applications
• Historical Background
• Background
• Kamal
• Nomography
• Slide Rules
• The Telemeter
• Introduction
• Preparation
• Initial String Setup
• Positioning the Knots
• Tools
• Device Overview: Telemeter
• Telemeter Sighting
• Principles
• The Telemeter Triangle
• Angular Size
• Unitlessness
• Extending the Scales
• Powers of 10 and Scale Jumps
• Wndsn String Theory
• Measurement Accuracy
• Functions
• Measuring Distance
• Determining Object Sizes
• Measuring Height
• Measuring in the Dark
• Thumb as Caliper
• Small-Angle Calculations
• Methods
• Height of Train vs. Length
• Distance of Cylindrical Objects
• Measuring the Distance to the Moon
• Measuring Time Against the Stars
• The Telemeter as Coordinate Scale
• Resection
• Triangulation
• Trilateration
• Triangulateration
• Resection Error Margins
• Introduction
• What is an Inclinometer?
• Preparing the Plumb Line
• Tools
• Transversal Scale
• Sexagesimal System
• Principles
• Parallel Translation
• Projection via Gravity
• Functions
• Finding Sine and Cosine
• Finding Tangent
• Calculating Slope
• Methods
• Measuring the Depth of a Well
• Measuring from an Elevation
• Measuring an Elevated Object
• Mastery of Time and Space
• Introduction
• Astronomy
• Foundations
• Astronomical Coordinate Systems
• Converting between Systems
• The Ecliptic
• The Declination of the Sun
• Introduction
• Tools
• Principles
• Calculating Time
• Seasonal ("Unequal") Hours
• Equinoctial ("Equal") Hours
• Functions
• Using the Calendar
• Using the Obliquity Arc
• Methods
• Sun Calculations
• Measuring Local Latitude
• Measuring Sun Altitude
• Calculating Sun Altitude
• Calculating Sun Declination
• Solar Time
• Determining Time
• Sun Compass
• Equatorial Sundial
• Determining Sunlight Hours
• Introduction
• Tools
• The Main Scales
• Principles
• Functions
• Moving the String
• Basic Equations
• Methods
• Finding Sine and Cosine
• Great Circle Calculations
• Determining Sunrise Bearing
• The Hour Angle
• Sun Azimuth from Hour Angle
• Sun Azimuth from Sun Altitude
• Latitude from Sun Altitude
• Appendix
• Metrology
• Uncertainty
• Accuracy vs. Precision
• False Precision
• Accuracy Determinations
• Precision of the Quadrant Telemeter
• Calculating Scale Accuracy
• Calibration
• Making Of
• Toolmaking
• Engravings
• Materials
• Brass Instrument Care
• Reference
• Trigonometry
• Spherical Trigonometry
• Museum/Archival Description
• Moon Heuristics
• High Precision Calculators
• Useful Tables
• Multipliers for a Given Angle
• Radian in Degrees in MIL in MOA
• Slope in Degrees
• Slope in Percent
• Calculations for 24 x 24 Shadow Square
• Calculations for 20 x 20 Shadow Square
• Sun Declination by Day
• Length Measurement Conversions
• Indexed Glossary
• Symbols
• Bibliography
• Contact

## List of Figures

1. Telemeter in action
2. Telemeter setup
3. Example: Kamal reconstruction
5. Example nomogram: Smith chart
6. Slide rule: Pickett N600-ES
7. Slide rule: Faber Castell 62/83N
8. Brass Telemeter
9. Calculating with the nomograph scales
10. Where to knot the string
11. Positioning the knots
12. Device overview: Telemeter
13. Telemeter sighting
14. The Telemeter triangle
15. Using arbitrary units
16. Extending the scales
17. Halving the distance
18. The Chinese Abacus
19. Wndsn string theory
20. Measuring from eye level
21. Bracketing a measurement
22. Operation
23. Simple distance measuring
24. Long distance measurement target
26. Known dimension of a structure
27. Measuring a parallel structure
29. 45°
30. Laser-engraved acrylic
31. Thumb as caliper
32. Using MIL or MOA for small angles
33. MKS-formula
34. Measuring the height of a train
35. Distance of cylindrical objects
36. Checking the distance with Google Maps
37. Lunar eclipse on July 27 2018
38. Measuring time against the stars
39. Easting via Telemeter
40. Northing via Telemeter
41. Magnetic compass triangulation
42. Gemma Frisius' triangulation
43. Telemeter trilateration
44. Two position fixes on a circle
45. Trilateration targets
46. Trilateration result
47. Triangulateration
48. Resection error margins
51. Threading the string through the slot
52. Device overview: Unequal Hour Quadrant
53. Highlighting the various scales
56. Projection via gravity
58. Slope, Quadrant, and inclinometer scales
59. Finding sine
60. Relationships on the Shadow Square
61. Sun altitude via LEGO brick
62. Cheops pyramid height
63. How to use the Shadow Square
64. Sighting with the Shadow Square
65. Finding tangent
66. Tangent on the slope scale
67. Elements in slope calculation
68. Slope in degrees
69. Slope in percent
70. Depth of a well via Quadrant
71. Depth of a well via Telemeter
72. Measuring from an elevation
73. Measuring an elevated object
74. The celestial sphere
75. Zenith and azimuth
76. Right ascension
77. The hour angle
79. Celestial sphere with the nav. triangle
81. The ecliptic
82. Solstices and equinoxes
83. Axial tilt
84. Sun declination by day
85. Device overview: Equal Hour Quadrant
86. Horary and calendar settings
87. Construction of the obliquity arc
88. Finding local latitude
89. Polaris and Southern Cross
90. Sun altitude via plumb line
91. Sun altitude via gnomon
92. Using the obliquity arc
93. Equation of time
96. The Quadrant as a Sun compass
97. AM and PM setup
98. Sundial afternoon setup
99. Using the sundial
100. Gnomon setup
101. Determining sunlight hours
102. Calculating sunlight through the year
105. Unit circle definitions on the Quadrant
106. Reading degrees from the cursor
107. Basic Sine Quadrant equations 1
108. Basic Sine Quadrant equations 2
109. Finding sine with the Sine Quadrant
110. Great circle calculation
111. Stages of twilight
112. Determine sunrise bearing
113. Hour angle and half-arc of daylight
114. Sun azimuth from Sun altitude
115. North and south from Sun azimuth
116. The Indian Circle
117. Local latitude from Sun altitude
118. Accuracy: trueness and precision
119. Sample measurement uncertainty
120. Calibrating device resolution
121. Wndsn fecit
122. Wndsn single-line fonts
123. Voyager 'Golden Record'
124. Engraved instructions
125. The "greedy" algorithm
126. Brass patina
127. Unit circle
128. Spherical triangle
129. Moon clock

## List of Tables

1. Scale configuration
2. Unitless example
3. Max. angular subtension
4. Sexagesimal fractions
5. Comparison of coordinate systems
6. Sun declination via longitude
7. Sun declination by month
8. Equation of time
9. Precision of the scales
10. Sample device uncertainty margins
11. Sample measurement uncertainty
12. Sample device resolution
13. Moon heuristics
14. Multipliers for a given angle
15. Radians in degrees in MIL in MOA
16. Slope in percent, degrees, and fractions
17. Slope in degrees and percent
18. Calculations for 24 x 24 Shadow Square
19. Calculations for 20 x 20 Shadow Square
20. Sun declination by day (JAN-JUN)
21. Sun declination by day (JUL-DEC)
22. Length measurement conversions

## List of Equations

1. Distance from angular size
2. MKS-formula
3. Distance from Umbra Recta
4. Height from Umbra Versa
5. Shadow length from Sun altitude
6. Sun altitude from shadow length
7. Hour angle via Sun azimuth
8. Declination via Sun azimuth
9. Sun azimuth via hour angle
10. Sun altitude via hour angle
11. Obliquity of the ecliptic
12. Sun declination via longitude
13. Time from Sun altitude
14. Sun altitude at noon
15. Solar zenith angle
16. Sun declination from Sun altitude
17. Equation of Time
18. Great circle bearing
19. Bearing (or amplitude) of rising Sun
20. Azimuth of rising Sun
21. Hour angle of sunrise from latitude
22. Hour angle via Sun altitude
23. Hour angle via Sun azimuth
24. Sun altitude from hour angle
25. Sun azimuth for a given hour
26. Sun azimuth from hour angle
27. Sun azimuth from altitude
28. Latitude from Sun altitude
29. Uncertainty
30. Device accuracy
31. Unit circle definitions
32. Trigonometric identities
33. Law of sines
34. Spherical right-angled triangle identities
35. Spherical law of sines
36. Spherical cosines law for sides
37. Spherical cosines law for angles
38. Spherical sine-cosine law
39. Slope in degrees
40. Slope in percent