x CONTENTS. 
PAGE 
Plate 5—(Continued.) 
gs, 29. Arrow or picket, 
‘30. Zollman’s instrument for measur- 
ing angles, 62 
«31. Astrolabe, 62 
«© 32. Hadley’s sextant, 66 
“© 33, 34. Compass and telescope, 63 
“35, 36. Schmalkalder’s prismatic 
compass, 64 
“ 37. Graphometer, 66 
‘« 38. Theodolite, 64 
‘39. Borda’s reflecting circle, 67 
“40,41. Water level and movable 
diopter, . : 968 
“42-44. Keith’s mercurial level, 68 
«45. Level and compass, 69 
« 46. Levelling telescope, 69 
‘47. Levelling compass, 70 
“ 48. Levelling circle, { 70 
‘49, 50. Explanation of the vernier, 67 
«51, 52. Levelling staves, . ; 70 
“« 53, 54. Target of levelling stave, m 
“55. Plate compasses, HY) 
“56. Mason’s level, . 68 
“ 57. Application of plane table, 61 
“58-60. Lehman’s method of topo- 
eraphical drawing, 1 Ss 
GLOSSARY. 
u = der Projection des Bergstriches, a = Projec- 
tion of the mountain tract. 
b= der Hohe der horizontalen Schicht, b = Height 
of the horizontal stratum. 
c=wahre Lange des Bergstriches, c= True 
length of the mountain tract. 
PLATE 6. 
Figs. 1,2. The armillary sphere, 76 
oO Illustrating the properties of the 
circle, ; 97 
‘4. Ill’g the properties of ‘the ellipse, 97 
ets lils the parallax, 97 
x 6, Ils the centrifugal foree of the 
earth, 124 
es i Ill’ the rotation of the earth, 123 
«8,9. Ill’g the proof of the earth’s 
being of spherical shape, 78 
and an elliptical spheroid, 124 
“10. Tll’g the local variation of gravity, 125 
«11. The parallelogram of forces, 126 
«* J2. [llustrating the points, circles, and 
terms ofthe terrestrial sphere, 79 
13. Ill’g the apparent rotation of the 
celestial sphere, 79 
«14. ILl’g the heliocentric and geocen- 
tric place of the planets, 98 
UD: g the perihelion distance, 99 
“* 16,17. Ill’g refraction, 126 
18. itt = the theory of jeeps of the 
sun and moon, . . 100 
19. Ill’g the phases of the moon, 83 
20. Ill’g the moon’s nodes, og BA 
«91. Ill’g the apparent course of Venus, 80 
« 99. Ill’g the theory of twilight, : ABE | 
«“ 93. Ill’g the theory of ebb and flow, 129. 
‘ 94,25. IlP?g the apparent course of 
superior and inferior planets, 80 
“ 26. Ill’g the resistance of the ether, 130 
PLATE 7. 
Fig. 1. Planetary system of Ptolemy, 
PAGR 
Plate 7—(Continued.) 
59 | Fi igs. 2. Planetary system of the Egyptians, 103 
3. Do. of Tycho de Brahe, 103 
eA Do. of Copernicus, 103 
« 6. Illustrating the velocity of planets, 104 
“ 7, TlP’g the inclination of the planetary 
orbits to that of the earth, . 104 
PLATE 8. 
Figs. 1. Group of stars in Hereules, . 144 
ore. Do. in Aquarius, . 144 
COE Sy, 28 Do. fan shaped, 144 
« 5. Nebula in Ursa, . 144 
<« 6. Do. in Gemini, 144 
« 7. Do. in Leo Major, 144 
« 8,9. Nebule in Monoceros, 144 
« 10. Nebula in Canes Venatici, . 144 
« 11. Do. in Sagittarius, 144 
*« 12,13. Do. in Auriga, 144 
senna: Do. in Andromeda, 144 
*« 15. Comet of 1819, 142 
co 6, 17, Do.or ot, 142 
« 18. Surface of Mars, 140 
*/49.. Do .of, Jupiter, 141 
« 20. Do. and rings of Satur, 141 
PLATE 9. 
Figs. 1. Illustrating the seasons, 109 
« 2,3. Daily and yearly motion of the 
earth, 5 85 
« 4. Illustrating the parallel sphere, 86 
«« 5. Ill’g the right sphere, 86 
« 6. Ill’g the 13 transits of Mercury i in 
the 19th century, : M1 
« 7,8. Il’g the phenomena of the 
transit of ee Mey 4, 
1786, . ae 
« 9-13. The sun’s spots, 131 
PLATE 10. 
Fig. 1. Illustrating the determination of 
longitude and latitude, . 86 
« 2. Ill’g the theory of the elliptical 
orbit of the earth, 107 
« 3. Ill’g the duration of a revolution 
of the moon, . 113 
« 4. Ue the daily revolution of the 
moon around the earth, 112, 113 
« 5. Ill’g the phases of the moon, 83, 113 
« 6. Orbits of the moons of Jupiter, 116 
« 7. Do. of the moons of Saturn, 117 
« 8. Do. of the moons of Uranus, 127 
«9. Orbit of the earth’s moon, a) 
« 10. Serpentine projection of the 
moon’s course on the plane 
of the earth’s orbit, . Bee vit 
GLOSSARY. 
| Abend, Evening ; — stern, Evening star. 
Abnehmender Mond, Decreasing moon. 
| Aphelium, Aphelion. 
Apsidenlinie, Line of Apsides. 
Aufsteigender Knoten, Ascending node. 
| Austritt heim Aufgang der Sonne, Emersion at 
sunrise ; —- beim Untergang der Sonne, Emer- 
sion at sunset. 
| Axe der Ekliptik, Axis of the Ecliptic. 
| Bahn des Merkur, Orbit of Mercury ; — der 
Venus, Orbit of Venus. 
