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  • Title: Cover: First Scientific Lecture-Course
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    • First Scientific Lecture-Course: Light
  • Title: Foreword: First Scientific Lecture-Course
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    • light of spiritual knowledge, and we who have received this
  • Title: First Lecture (First Scientific Lecture-Course)
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    • shall at most be able to contribute a few side-lights which may help
    • “ether” or the like, as underlying the phenomena of light
    • justified to say that when we perceive a phenomenon of light or
    • light or colour for example, the objective wave-movement in the
    • light will interact with matter that is in its path. Goethe puts into
    • words how light and matter interact. That is no “law”; it
    • considerable light on what is seeking to come into our Science by way
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  • Title: Second Lecture (First Scientific Lecture-Course)
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    • of light and colour rather as follows: — We ourselves are
    • affected, say, by an impression of light or colour — we, that
    • about the phenomena of light, you will find contradictory and
    • only happens to a slight extent we can still bear it; if to a great
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    • on that side. By immersion in water the object has become lighter,
    • — it loses some of its weight. We can test how much lighter it
    • balance. We find the object has become lighter to the extent of the
    • body becomes as much lighter as is represented by the weight of
    • is lightened, leaving only about 20 grammes. What does this signify?
    • exception of the spinal cord — are only to a very slight extent
    • on the other hand becomes light and clear inasmuch as we are able to
    • Will in matter and on the other hand the lightening of Will into
    • then see upon the one hand the lightening into Intelligence, brought
    • which comes about when we open our eyes and are in a light-filled
    • with pressure. When we expose ourselves to light, insofar as the
    • light works purely and simply as light, not only do we lose nothing
    • it at all, can fail to perceive that by exposing himself to the light
    • unite with what comes to meet us in the light; we shall discuss this
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  • Title: Third Lecture (First Scientific Lecture-Course)
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    • and by. We shall have to go into the phenomena of light and colour
    • explain is in its essence a special kind of interplay of light and
    • dimming or clouding of the light. I was trying to show how through
    • the diverse ways in which light and dark work together —
    • induced especially by the passage of a cylinder of light through a
    • treatment of light and colour. The strange education we are made to
    • light and colour, let us now begin again, but from the other end. I
    • light came to his notice. Among other things, he learned of the
    • colourless light go through a prism the colourless light is analyzed
    • we let a cylinder of colourless light impinge on the screen, it shows
    • light, the physicists went on to say, we get the sequence of colours:
    • red, orange, yellow, green, blue — light blue and dark blue,
    • explain it thus, so he was told — The colourless light already
    • make the light go through the prism, the prism really does no more
    • than to fan out and separate what is already there in the light,
    • so: If then the light is analyzed by the prism, I shall see it so on
    • yonder wall. He really expected to see the light in seven colours.
    • the stain, the dark and clouded part, met the lighter surface.
    • If we let light pass
    • Put a prism in the way of the body of light that is going through
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  • Title: Fourth Lecture (First Scientific Lecture-Course)
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    • follows: When I look through darkness at something lighter, the light
    • light colours, i.e. in the direction of the red and yellowish tones.
    • white — at any whitish-shining light through a thick enough
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    • water through which you send a stream of light so that the liquid is
    • illumined, you will be looking at the dark through something light.
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    • Ur-phenomenon: Light through dark — yellow; dark through light
    • sent a cylinder of light through a prism and so obtained a real scale
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    • cylinder of light, the light in some way goes through the prism and
    • path of the light — that is, a body with convergent faces. In
    • passing through the prism, the light gets darkened. The moment we
    • send the light through the prism we therefore have to do with two
    • things: first the simple light as it streams on, and then the dimness
    • interposed in the path of the light. Moreover this dimness, as we
    • said, puts itself into the path of the light in such a way that while
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  • Title: Fifth Lecture (First Scientific Lecture-Course)
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    • solid body spreads its light and we let this light go through a
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    • obtain a luminous picture with the light that spreads from a glowing
    • light or little bands of light at different places, according to the
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    • light above all in 1859 by the famous experiment of Kirchhoff and
    • Bunsen. If we arrange things so that the source of light generating
    • quality of light which would be appearing at this place (i.e. in the
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    • must be at least equal to the strength of light that is just being
    • apparatus, we here generate the cylinder of light; we let it go
    • on to the screen. Into the path of the cylinder of light I place a
    • path of the cylinder of light the solution of iodine in carbon
    • disulphide, this light is extinguished. You see the spectrum clearly
    • that I cause the light to go through this solution — iodine in
    • relation to the light? How do they, simply by dint of their material
    • existence so to speak, develop such relation to the light that one
    • say: When colourless sunlight — according to the physicists, a
    • “phosphores” or light-bearers. This is what they meant:
    • exposed this to the light, a strange phenomenon occurred. After
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  • Title: Sixth Lecture (First Scientific Lecture-Course)
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    • in the realm of light, it will also help us observe and understand
    • illustrated in the realm of Light.
    • phenomena of light in rather recent times, historically speaking.
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    • it diagrammatically, let me represent the latter simply by a light
    • through the glass? You were no doubt told that rays of light proceed
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    • the direction of the “ray” I am now drawing, the light
    • without the glass. Now this is said to be due to the light being
    • When the light passes from a more tenuous into a denser medium, to
    • find the direction in which the light will be refracted, you must
    • the light went on its way without being hindered by a denser medium,
    • it would go on in this direction. But, they now say, the light is
    • light” is seen through the denser medium.) Here then again, at
    • If the light went straight on it would go thus: but at this second
    • said to produce the final direction of the ray of light and thus to
    • glass. Here, to begin with, the light impinges on the plate, then it
    • ascribe this faculty ....) the light is somehow projected out into
    • discriminate, however delicately, between the darker and lighter
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  • Title: Seventh Lecture (First Scientific Lecture-Course)
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    • that wherever colours arise there is a working-together of light
    • true conception of what underlies this interplay of light and
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    • VIIa), — candles as sources of light — and an
    • left-hand source of light. It is produced, in that the light from
    • arises where the light from the right-hand source is covered.
    • is illumined by both sources of light. Now I will colour the one
    • (the left-hand) light. I make the light go through a plate of
    • coloured glass, so that this one of the lights is now coloured
    • that the shadow of the rod, due to this left-hand source of light
    • source of light to red, you see the shadow green. What was mere
    • source of light to green, — the shadow becomes red. And when
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    • shadows. I darken this source of light and get green, said Goethe
    • I darken this source of light, the white screen as a whole shines
    • with colour. The light and darkness then work together in a
    • different way. We note that by darkening the light with red the
    • physical apparatus. This physical apparatus, mingling light and
    • by the red darkening of the light, and the green afterimage,
    • descend from Light to Warmth. Warmth too we perceive as a condition
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  • Title: Eighth Lecture (First Scientific Lecture-Course)
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    • at some distance from you, you see the flash of light in the
    • thunder after you see the lightning. If you neglect that there is
    • such a thing as a velocity of light, you may then call the time
    • that elapses between your perception of the impression of light and
    • then put a very light and mobile dust into the tube that is filled
    • to apply to the phenomena of sound and light? This surely would be
    • sensations of light and sound are so. None of you are there outside
    • light and sound the inner life and being which you experience in a
    • Just as the light affects the eye and the optic nerve receives the
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    • of light. Having begun with the mistaken premise that eye and ear
    • eye and the phenomena of light. What comes into our consciousness
  • Title: Ninth Lecture (First Scientific Lecture-Course)
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    • enabling us to throw some light on the educational use of
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    • akin to the light that spreads through space, — the latter
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    • Figure IXb — were a source of light and here a mirror. A
    • cylinder of light is reflected, this is then gathered up again by a
    • second mirror, and an image arises here. We may then say, the light
    • generally imagines wave-movements to spread out. Even as light
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    • extent. For sound and light, they were imagining wave-trains,
    • Hertz's discoveries were still the twilight of the old, tending as
    • the green light on the glass; that is fluorescent light. I am sorry
    • they thought of light for instance being propagated in the form of
    • the body of light that is going through this tube — this
    • fresh experiments now came to light, which in their turn seemed
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    • velocity of light, while the velocity of the α-rays is
    • about one-tenth the velocity of light. We have therefore these
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  • Title: Tenth Lecture (First Scientific Lecture-Course)
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    • as we have seen, the phenomena of light had been brought into a
    • the raying light itself something like radiating electricity. I do
    • object, as we should do with light. Light throws a shadow. So do
    • to meet them, giving a greenish light. The velocity of the canal
    • greenish-yellow, fluorescent light. The rays that shew themselves
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    • of light, colours could be seen arising, but man had not enough
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    • and algebraic too) to the phenomena of light or sound, then in your
    • the wave-theory of light, or Newton's corpuscular theory, —
    • when you connect it with the phenomena of light. What you then do
    • different when we go down from the phenomena of light and sound,
    • tubes makes itself known to us in phenomena of light, etc. Whatever
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    • way. The phenomena of sound and tone and light are akin to the
    • intermediate between light and sound on the one hand, electricity
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