30 



Insulation in el 



ectrici 



GENERAL INDEX. 

 ty described ..... ELECT. 



INTENSITY of terrestrial magnetism, variations of . MAGN. 



of heat producible by the voltaic battery . . GALV. 



of magnetic forces in relation to distance . MAGN. , 



method of measuring . . 



methods of determining . . 



at different heights above the 



earth's surface ........ 



Intermitting springs, phenomena of, accounted for . . POP. INT. . 



Introduction to mechanics ...... . 



to astronomy ...... 



to hydrostatics ...... . 



to pneumatics ...... 



to optics ....... 



Inversion of the images of objects on the retina, why not observed 



/row, illustrations of its being attracted by the magnet . MAGN. . 



. . magnetic, attraction and repulsion of . 



. . and steel^ different qualities of, how they affect the mag- 

 netic power . . . . . . . . 



retain magnetic power in proportion to their 



hardness ........ . 



table of the relative magnetic power of dif- 

 ferent species of ....... 



. . why it is less retentive of magnetic power than steel - 



. . Scoresby's experiments on its magnetism . . 



. . filings ) curious arrangement of, when under magnetic 



influence ........ 



attracted by the connecting wire of a galvanic 



battery ........ ELECT. MAGN. 



JONES'S hygrometer described ..... THERM. 



Jupiter and his four moons described .... POP. INT. 

 . . eclipses of his satellites, and method of finding the lon- 

 gitude by ........ 



Juxtaposition^ a method of making artificial magnets . MAGN. . 



KALEIDOSCOPE, principle of its construction . . . OPT. INST. 

 KATER'S remarks on the processes for making artificial magnets MAGN. 



azimuth compass described .... 



KEITH'S register-thermometer described .... THERM. 



KENNERSLEY'S electrical air-thermometer described . ELECT. 



theory of the phenomena of the rainbow . NEW. OPT. 



astronomical telescope . . . 



KEWLEY'S balance thermometer described . . . THERM. 



KNIGHT'S method of making artificial magnets . . MAGN. . 



LAND COMPASS, construction of .... MAGN. 



LANE'S discharging electrometer ..... 



Lapis electricus, description of that stone ... ELECT. 



Lateral explosion of electricity ..... 



JMW of induction, experiments for the development of . 



. . of electro-magnetic action ..... ELECT. 3 



direct consequences of . 1 



its effects on the magnet needle 



of inductions, its application to the explanation of 



particular facts'' .... . . . . 



of refraction of light discovered by Snellius . . NEW. ( 



of refraction of homogeneous light . . . 



of magnetic forces ...... MAGN. 



Layers, alternate, of muscle and brain from a galvanic pile GALV. . v . 



LEBAILIF'S improved galvanometer described . . ELECT. 'M.jl 



Lenses defined and severally described . POP. INT. 89. OPT. IN> 



effects of their combination .... ' 



tables of the magnifying powers .... . -4| 



spherical aberrations of light in, and in mirrors . 1 



minimum of spherical aberration in ... \. 



method of calculating the foci of ... 



of grinding ...... *-?' 



of polishing and centering . . . it ^ 



-. T Tr 



25 



. 10 



16 



. 25 



8287 



87 

 63 



129 



.3055 



5664 



6573 



74100 



78,79 



. 2,3 



3 



10 

 . 14 



15 



, 11 

 14 



. 21 



52 



50 

 36 



52,53 

 43 



55 

 51 



7072 



37,38 



43 



. 5 



6 



47,48 

 45 



55, 60, 61 

 38 



. 53 



41 



2831 



: c-9 



