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 three-point problem 15 
Tables 16 
1. Polaris; times of culmination and elongation 16 
2. Polaris; azimuth at elongation 18 
3. Polaris; azimuths and altitudes at different hour angles 19 
4. Projections for large areas 29 
5. Projections; scale t2?oott> latitudes 0° to 80° 41 
6. Projections; scale irjio o> latitudes 0° to 80° 51 
7. Projections; scale Ti ^ «, latitudes 25° to 50° 63 
8. Projections; scale ¥3 fonr, latitudes 26° to 50° 69 
9. Areas of quadrilaterals; 30 / extent, latitudes 0° to 90° 77 
10. Areas of quadrilaterals; 15' extent, latitudes 0° to 90° 80 
11 . Areas of quadrilaterals; 10' extent, latitudes 0° to 90° 86 
1 2. For conversion of arc into time 91 
13. For conversion of time into arc 92 
14. For conversion of mean time into sidereal time 93 
15. For conversion of sidereal time into mean time 94 
16. For interconversion of feet and decimals of a mile 95 
17. For conversion of wheel revolutions into decimals of a mile 96 
18. Five-place logarithms of natural numbers 97 
19. Five-place logarithms of circular functions expressed in arc and time. 119 
20. Geodetic position computations 164 
21. Log. m, for use in computing spherical excess 240 
22. Mean refraction 241 
23. Corrections for curvature and refraction 242 
24. For obtaining differences of altitude 243 
25. Horizontal distances and elevations from stadia readings 259 
26. For converting metric into United States measures 268 
27. For converting United States measures into metric 269 
28. For interconversion of miles and logarithms of meters .. _ „ 270 
Convenient equivalents 282 
Constants '. 284 
Linear expansion of metals 284 
3 
