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 Title: First Lecture (First Scientific LectureCourse)
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 of their angles, — all these are things which we determine
 Title: Second Lecture (First Scientific LectureCourse)
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 at an angle to form a wedge. This hollow prism is then filled with
 Title: Third Lecture (First Scientific LectureCourse)
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 a larger angle, I got the picture at a given place, if I then made
 the angle smaller I should get it elsewhere. Now I can do the whole
 IIIb), — the prisms meeting at the angle. I should again
 Title: Fourth Lecture (First Scientific LectureCourse)
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 mirrors, set at a very small angle to one another, — here is a
 angles to the direction in which the light is being propagated. When,
 vibrating at right angles to the direction in which the light is
 light is, once again, a vibration at right angles to the direction in
 Title: Seventh Lecture (First Scientific LectureCourse)
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 experience. Now comes the veriest tangle of confused ideas. The
 Title: Eighth Lecture (First Scientific LectureCourse)
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 semicircular canals, — their planes at right angles to each
 Title: Tenth Lecture (First Scientific LectureCourse)
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 (albeit, in a certain sense, from the wrong angle). What men
 science. The regularities and laws in line and triangle and
 angles of a triangle (
 Xa) together make a straight angle — an angle of
 by drawing a parallel to the base of the triangle through the
 vertex. We then say: the angle α, which we have here,
 α' are alternate angles and therefore equal. I can
 transfer this angle over here, then. Likewise this angle
 The angle
 angle of 180° as they obviously do, α + ß +
 angles together make 180°, breaks down. For I should then
 — the space of ordinary Geometry — the three angles of
 a triangle add up to 180° exactly, it is no longer so when I
 envisage another and perhaps more real space. The sum of the angles
 geometries are possible, for which the sum of the three angles of a
 triangle is by no means 180°.
 angle.”
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