SECTIONS. INDEX OF SUBJECTS. 



271 



the magnetic intensity of the earth, 1831- 

 32, 560. 



Magnetic action of the compass in iron 

 steamships, Gt. B. Airy on correcting the, 

 1838, 21. 



Ji- — action, new, Herr Pliicker on experi- 

 ments belonging to a, 1848, 2. 



or diamagnetic bodies of any form, 



Prof. W. Thomson on the equilibrium of, 

 imder the influence of the terrestrial mag- 

 netic force, 1848, 8. 



— — causation, Q-. Towler on, 1846, 33. 



charts of declination, S. Beswick on a 



method for computing, 1850, 3. 



• condition, Eev, Dr. Scoresby on the 



mode of developing the, 1846, 35. 



-i condition of matter, Prof. Faraday on 



the, 1847, 20. 



curves, with applications to problems 



. in the theories of heat, electricity, and 

 fluid motion. Prof. W. Thomson on, 

 1853, 18. 



— — declination, J. A. Broun on the diurnal 

 variation of the, and the annual variation 

 of magnetic force, 1849, 8. 



— — - declination, J. A. Broun on the diurnal 

 variations of the, at the magnetic equator, 

 and the decennial period, 1860, 21. 



declination, J. A. Broun on the effect 



of height in the atmosphere on the diur- 

 nal variation of, 1850, 7. 



declination, J. A. Broun on the mode 



in which the diurnal law of, varies 

 from place to place, and the probable 

 position and epoch of the line of least 

 diurnal variation near the equinoxes, 

 1860, 20. 



dip at Stockholm, Dr. Siljestrom on 



the, 1858, 27. 



dip and total force, J. Welsh on a 



sliding rule for converting the readings 

 of the horizontal and vertical force mag- 

 netometers into variations of, 1851, 20. 



disturbances, on the amount and fre- 

 quency of the, and of the aurora at Point 

 Barrow, on the shores of the Polar Sea, 

 by General Sabine, 1857, 14. 



disturbances, Eev. Dr. Lloyd on the 



periodicity of, 1845, 12. 



elements, Eev. Dr. Lloyd on simulta- 

 neous changes of the, 1841, 26. 



equator, J. A. Broun on the diurnal 



variations of the magnetic declination at 

 the, 1860, 21. 



field, on some peculiarities of the, by 



Prof. Tyndall, 1854, 16. 



force, earth's, Eev. Dr. Lloyd on the 



regular variations of the direction and in- 

 tensity of the, 1843, 12. 



force, terrestrial, on Ihe intensity of 



the, by J. Drummond, 1858, 24. 



force, terrestrial, Eev. Dr. Lloyd on, 



1836, 31. 



forces of rods of different lengths, ex- 

 periments upon the, by Prof. Jacobi, 1840^ 



Magnetic and diamagnetic forces, on motions 

 exhibited by metals under the influence 

 of, by W. S. Ward, 1849, 46. 



and electrical force, on the law of, by 



Sir W. S.Harris, 1856, ii. 



induction dip-circle, new, J. A. Broun 



on a, 1860, 23. 



induction in crystalline substances. 



Prof. W. Thomson on the theory of, 1850, 



23- 



■ instrument, new, by Eev. Dr. Scoresby, 



1836, 28. 



instrument to guard the eyes of grinders 



from fragments of steel, 1831-32, 60. 



intensity instrument (Hansteen's), effect 



of three iron cylinders upon, 1851, 9. 



intensity of the earth, on the method 



of employing vibrating magnets in the 

 investigation of the, by Sir W. S. Harris, 

 1831-32, 560. 



intensity, terrestrial, in relation to the. 



influence of height. Prof. J. D. Forbes on, 

 1836, 30. 



investigations, W. Petrie on the results 



of an extensive series of, 1846, 33. 



iron ore. Prof. T. Andrews on a new 



variety of, 1852, 41. 



lines, isoclinal, in Yorkshire, Prof. Phil- 

 lips on, 1850, 14. 



machine, large, Eev. Dr. Scoresby on 



a, 1845, 15. 



manipulation, Eev. Dr. Scoresby on a 



new process of, and its effects on hard 

 steel and cast iron, 1844, 12, 100. 



needle. Sir John Eoss on the deviation. 



of the, peculiar to Liverpool, 1854, 12. 



needle, W. H. Barlow on the existence of 



alternating diurnal currents of electricity 

 at the terrestrial surface, and their con- 

 nexion with the diurnal variation of the, 

 1847, 21. 



needles and bars. Prof. Christie on 



their preservation from oxidation, 1841, 

 41. 



observations, Eev. Dr. Lloyd on the 



mean results of, 1848, i. 



• and meteorological observations at Sir 



T. M. Brisbane's observatory, Makerstoun, 

 in 1842, J. A. Broun on the results of the, 

 1845, 15. 



observations made at Sir T. M. Bris- 

 bane's observatory, J. A. Broun on some 

 results of the, 1846, 32. 



observationsin Ireland, Eev. Dr.Lloyd's 



account of, 1834, 557. 



observations at Trevandrum, results ofi 



by J. A. Broun, 1858, 30. 



observatory at Alten, on the establish- 

 ment of a, 1847, 34. 



• and meteorologic observatory at Bom- 

 bay, A. B. Orlebar on the, 1847, 28. 



Magnetical observatory at Dublin, Eev. Dr. 

 Lloyd's account of the, 1837, 20. 



• observatory of Mimich, Dr. Lamont's 



account of the, 1840, 26. 



, meteorological, find astronomical ob- 



