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INDEX.

GLA
Colours, low tint, 148

Von Benzold's method of com

bining, 140
Complementary colours, 31, 140
Concave and convex films of selenite,

action of, on polarised light, 78
Convergent and divergent rays, phe:

nomena due to, 104
Couleurs dégradees, 148
Cross, brushes and rings produced in

crystals by polarised light, 104
Crystal rings, 104

polariscope for showing, III
Crystals, angles made by the optic

axis of, 123
– bi-axal, 76, 121, 126, 131
- circularly polarising, 52
doubly refracting, 31
positive and negative, 105, 132
uni-axal, 76, 105, 131
system of, 106, 127

Difference of phase, 34
Divergent and convergent rays, phe-

nomena due to, 104
Double-image prism, 21
Double refraction, 17
Doubly refracting crystals, 31, 60

Electro-optics, 67
Elliptically polarised light, 36, 81
Ether, the, 5, 34, 94
Extraordinary and ordinary rays, 19,

74

AIR
Airy's spirals, 119
Analyser, 2, 24
Angle, polarising, 8
Angles made by optic axes of crystals,

123
- instrument for determining, 126
Anorthic system of crystals, 107, 128
Atmospheric polarisation, 91
Axis, optic, 17, 105, 128

- of crystals, angles made by, 123

Benzold, Von, method of combining

colours, 140
Bi-axal crystals, 76, 121, 126, 131.
Biquartz, action of, on polarised light,

52
Brushes, Haidinger's, 103

and rings produced by crystal plates

by polarised light, 104
Chromatic polarisation, 25, 30
Circular polarisation, 47, 69

by doubly refracting crystals, 60
quartz, 47
reflexion, 69
total reflexion, 60, 69
crystals producing, 52
right and left handed, 54
rings and brushes produced in

crystals by, 116
Sir C. Wheatstone's instrument

for producing, 71, 81

spectrum of, 52
Clino-rhombic system of crystals, 107

127
Clock, polar, 91
Colour, on what it depends, 34
Colours, collateral combination of, 143
combination of two, 142, 145

three, 145
complementary, 31, 140

composition of, by polarised
light, 140

Fresnel's rhomb, 70

– theory, 15
Glass plates, pile of, for polarising

light, 13
Glass, unannealed, action of, on po-

larised light, 87

120

-

HAI

POL
Haidinger's brushes, 103,

Phase, difference of, 34
Heat, the effect of, in altering mole- Plane or rectilinear polarisation of
cular arrangement, 90, 128

light, 6, 36
Hexagonal system of crystals, 106

Polar clock, 91
Hofmann's polarimicroscope, 112

Polarimeter, 27
Hyperbolas produced by Iceland spar, Polarimicroscope, Hofmann's, 112

Polarisation, atmospheric, 91
quartz plates, 120

chromatic, 25, 30

methods of, i
Iceland spar (see also Selenite), 17

of light, explanation of the term, 5
– hyberbolas produced by, 120 Polariscopes, 17
sphere of, 19

for showing crystal rings, III
Intensity of light, on what it depends, Norremberg's, 25, 73, 112

Adams', 115
34
Interference, 34, 37

Savart's, 121
Intermediate section, 75, 83

Polarised light, action of biquartz on,

52
Kerr's experiments, 67

doubly refracting crystals

on, 31
Lemniscata produced by bi-axal crys-

heat in altering molecular
tals, 121, 131

arrangement of crystals,
Light, colour of, on what it depends,

when submitted to, 90,

128
34
- intensity of, on what it depends, 34

quartz on, 47, 119
- polarisation of (see Polarisation)

strain or pressure on, 88
- wave or undulatory theory of, 30

sugar on, 55
due to vibrations of the ether, 5

unanncaled glass on, 87
Low tint colours, 148

by double refraction, 17

reflexion, 8
Magnetic rotation, 66

from fine particles, 95
Methods of polarisation, I

the surface of water, 92
Mica, circular polarisation produced

- refraction, 12
by, 65, 76

the sky, 93
Microscope, polari-, Hofmann's, 112

tourmalin, 2, III
Monochromatic light, figures pro-

Polarised light, circularly, 47, 69
duced by, 132

- by doubly refracting crystals,

60
Negative and positive crystals, 105,

quartz, 47
132

reflexion, 69
Nicol's prism, 22

total reflexion, 60
Norremberg's polariscope, 25, 73, 112

cross, brushes, and rings pro-

duced by, 104
Oblique system of crystals, 107, 124,

crystals producing, 53
127

right and left handed, 54
Optic axis, 17, 105, 128

Sir C. Wheatstone's instru-
of crystals, angles made by, 123

ment for producing, 71, 81
-instrument for determining

spectrum of, 52
the angles made by, 126

Polarised light, composition of colours
Ordinary and extraordinary rays, 19,

by, 140
74

elliptically, 36, 81
Urthorhombic system of crystals, 107, plane or rectilinear, 6, 36
123, 127

rings, cross, and brushes pro-

duced by crystals when sub-
Particles, light polarised by reflexion

mitted to, 104
from, 95

spectrum of, 40, 52, 84

POL
Polariser, 2, 24
Polarising angle, the, 8
Positive and negative crystals, 105,

132
Pressure or strain, effect of, on polar-

ised light, 88
Prism, double image, 21
- Nicol's, 22

Quarter-undulation plate, 65
Quartz, action of, on polarised light,

47, 119
circular polarisation produced by,

47
- plates, hyperbolas produced by,

I 20

– right and left handed, 50
Rays, convergent and divergent, phe-

nomena due to, 104
ordinary and extraordinary, 19, 74
Rectilinear, or plane polarisation of

light, 6, 36
Reflexion and refraction, Tyndall's

apparatus for demonstrating the

laws of, 10
Reflexion, polarisation of light by, 8
— total, circularly polarised light,

produced by, 60
Refraction and reflexion, Tyndall's

apparatus for demonstrating the

laws of, 10
Refraction, double, 17
Regular system of crystals, 106
Rhomb, Fresnel's, 70
Rhombohedron of Iceland spar, 17
Right and left handed circular polari-

sation, 54
Right and left handed quartz, 50
Rings and brushes produced by crystal

plates when submitted to the

action of polarised light, 104
polariscope for showing the, III
Rock crystal (see Quartz)
Saccharometer, 56
Savart's polariscope, 121
Section, intermediate and supplemen-

tary, 75, 83
Selenite (see also Iceland Spar), 30, 75

colours produced by films of, 31
- concave and convex films of, 78

WHE
Selenite designs for illustrating chro-

matic polarisation, 44, 78
wedge, 39, 42
Silver plate, circular polarisation of

light, by reflexion from, 71
Sky, polarisation of light by the, 93
Spar, Iceland (see also Selenite), 17
Spectra of polarised light, 40, 52, 84
combination of the colours of the,

140
Spirals, Airy's, 119
Strain or pressure, effect of, on polar-

ised light, 88
Sugar, action of, on polarised light,

55
Supplementary section, 75, 83
Talc (see Mica)
Temperature, variation of the optic

axes of crystals with the, 128
Tetragonal system of crystals, 106
Total reflexion, circularly polarised

light, produced by, 60, 69
Tourmalin, 2, III
Tyndall's, Dr., apparatus for demon-

strating the laws of reflexion and

refraction, 10
Unannealed glass, action of, on polar-

ised light, 87
Undulatory theory of light, 30
Uni-axal crystals, 76, 105, 131
Vibrations of the ether, direction of,

6, 13

Vibratory theory (see Wave Theory)
Von Benzold's method of combining

colours, 140
Water, light polarised by reflexion

from the surface of, 92
Wave length, 33
theory, 30

Sir C. Wheatstone's instrument

for illustrating the, 35
Wedge of selenite, action of, on polar-

ised light, 39, 42
Wheatstone's, Sir C., instrument for

circularly polarising light, 71, 81
instrument for illustrating the wave
theory, 35
- polar clock, 97

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