INDEX OF THE PLATES. 



NAVIGATION. 



Sailing, Great Circle, ii. 26 — 34. 



Current, iii. 3 — 6. 



Mercator's, ii. 24, 25. 



Parallel, ii. 20 — 23. 



Plain, ii. & iv. 5—18. ii. 19. 



Traverf", iii. I, 2. 

 Convoy, Naval Tactics, iii. i — 3. 

 Tide, i. 4 — 8. 



Trigonometry ,( Plate iii. ) iii. i — 5. 

 Variation, ii. (i. & ii.) 7 — 9. 



OIL MILL. 

 Plan and Elevation, by Smeaton 



NAVAL TACTICS. 

 (5« Navigation, Plate iii.) 



NOTATION. 



Ancient Arithmetical Charafters 



(5« MlSCEtLAKY, i, 7.) 



OPTICS. 



Aberration, i. i. 

 Altitude, iv. 11. 

 Angle, i. 2 — 4. 

 Burrougii's Machine, i. 5. 

 Burning Lens, Parker's, ii. I — 3, 

 Camera Obfcura, iii. i — 7. 

 Catoptric Ciftula, iv. i, 2. 

 Dioptrics, iv. 2* — 4. 

 Difperf'o . of Light, iv. 5 — 7. 

 Eye, V. 2. 

 Focus, iv. 8. 



Virtual, V. i. 

 Grinding Machine, v, 3 — 7. 

 Helioftata, vi. I. 

 Hones, Bed of, vi. 2. 

 Horopter, vi. 3. 

 Incidence, xv. I. 

 Inclination, xv. i. 



Lens, vi. 5 — 11. vii. i — 12. viii. i— iz. 

 Light, ix. I — 9. 

 Looking-glafs, iv. 9. 

 Magic Lantern, x. i — 5. 

 Magnitude, Apparent, x. 4. 

 Micrometer, x. 5 — 11. 



Herfchel's Lan p, xi. 5, 6. 



Maflcelyne's; xi. I. . 



Troughton's, xi. 2 — 4. 

 Microfcope, xii. i — 12. 



Adams's Compound, xiv. i — 7. 



Culpepper's, xiii. 2. 



Marfliall's, xiii. i. 



B. Martin's, xiv. 5 — n. 



Solar, xiii. 6 — 8. 



Improved, xvi. 1 — 7. 

 Mirror, xv. 2 — 18. 

 Mufcas Volitantes, xv. 18. 

 Objeft Glafs, centering, xv. 19, 20. 

 Opera Glafs, xv. 21. 

 Optical Inequality, xv. 22. 

 Optometer, xvii. i — 8. 



OPTICS. 



Parhelion, xv. 23, 24. 

 Pencil of Rays, xvii. 10. 

 Place, Optic, xvii. 9. 

 Polemofcope, xvii. 12. 

 Polyhedron, xvii. 11, 12. 

 Polyoptrum, xvii. 13. 

 Rainbow, xviii. i — 9. 

 Refieftion, " ^ 



Refieftion, xvii. 14, 

 Reflexibilily, xvii. ij. 

 Refraction, vi. ^. 



of Light, xviii. 10 — 



Refrano-IKilit V n: T.icrlit. viv. T — 



ot Light, XI 

 Refrangibility of Light, 

 Shadow, iv. 10 — 13. 

 Vifible, iv. 14 — 16. 

 Vifiou, iv. 17. 



o — 24. 



xix. I — 13 



ORGAN. 



Church Organ, interior Profile of, ii. 



Keyr, Pipes S:c. '. 



Organ, mad ^ by Flight and Robfon, iii. iv. 



PAINTING. 



Apollo Belvidere, i. 



Face, Human, d'verfities of, ii. iii. 



African, iii. 



American, iii. 



Afiatic, iii. 



European, iii. 



Plates i. ii. 



Plates i. ii. 



PANORAMA. 



PAPER-MILL. 



PERSPECTIVE. 



Anamorphofis, i. I — 8. 

 Dillance of a Vanifhing Line, i. 9. 

 Line, Horizontal, '. 11. 

 Pcrfpeftivc, Theory of, i — xii. 

 Point of a Vaniihing Line, i. 10. 



PISE BUILDINGS. 

 (5« Agriculture, P/aie XXXIU.) 



PLANETARY MACHINES. 



Cometarium, i. 



by W. Jones, ii. I — 3. 

 Dial for the Equation of the Sun's Center, ix. i. 

 Sun's Declination, ix. 2. 

 of mean High Tides, ix. 8. 

 for the Moon's Equation of t^e Center, ix. 4. 

 Heliocentric Latitude, ix. 5. 

 Horizontal Diameter and Parallax, ix. 7. 



Parallax, ix, 6. 

 Reduftion of the EcHptic to the Equator, ix. 3. 

 Dials, graduated for ihewing Planetary Phenomena, ix. 

 Equation Mechanifm of a Planet's Orbit, by Huygens, 

 iii. I. 



i 



