CONTENTS 
Page. 
Letter of transmittal 7 
Rules for solution of right-angled triangles 9 
Reduction to center 10 
Graphic reduction to center 12 
Solution of triangles, two sides and included angle being given 12 
Three-point problem 13 
Graphic solution of the three-point problem 15 
Method of fixing a meridian at any time by hour angle 16 
Tables 18 
1. Polaris: times of culmination and elongation 18 
2. Polaris : azimuth at elongation 21 
3. Polaris : azimuths at different hour angles 22 
4. Polaris: azimuths and altitudes at different hour angles 28 
5. Projections for large areas 37 
6. Projections: scale 12 5V0 o) latitudes 0° to 80° ' 49 
7. Projections: scale o jje o> latitudes 0° to 80° 59 
8. Projections: scale 62^005 latitudes 25° to 50° 71 
9. Projections: scale ^5^0 o> latitudes 26° to 50° 77 
10. Projections : scale j^m, latitudes 25° to 50° 85 
11. Areas of quadrilaterals; 30^ extent, latitudes 0° to 90° 94 
12. Areas of quadrilaterals; 15^ extent, latitudes 0° to 90° 97 
13. Areas of quadrilaterals; 10^ extent, latitudes 0° to 90° 103 
14. For conversion of arc into time 1 08 
15. For conversion of time into arc 109 
16. For conversion of mean time into sidereal time 1 10 
17. For conversion of sidereal time into mean time Ill 
] 8. For interconversion of feet and decimals of a mile 112 
19. For conversion of wheel revolutions into decimals of a mile 113 
20. Five-place logarithms of natural numbers 123 
21. Five-place logarithms of circular functions expressed in arc and time. 145 
22. Geodetic position computations 1 90 
23. Log. m, for use in computing spherical excess 26() 
24. Mean refraction 267 
25. Corrections for curvature and refraction 268 
26. For obtaining differences of altitude 270 
27. Horizontal distances and elevations from stadia readings 285 
28. For converting metric into United States measures 294 
29. For converting United States measures into metric 295 
30. For interconversion of miles and logarithms of meters 296 
Convenient equivalents 308 
Constants ' 310 
Linear expansion of metals 310 
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