popper-logic-scientific-discovery

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some structural components of a theory of experience
Figure 2
light-ray, and one at most may be electrically non-neutral 5 ) which are
both ‘pure cases’ in the sense that the beam A is monochromatic, that is, a
selection according to the momentum a 1, whilst the beam B passes
through a narrow slit Sl and is thereby subjected to a physical selection
according to position. The B-particles may be supposed to have the
(absolute) momentum b 1. Some of the particles of these two beams
will collide. We now imagine two narrow partial rays [A] and [B] which
intersect at the place P. The momentum of [A] is known; it is a 1. The
momentum of the partial ray [B] becomes calculable as soon as we have
decided upon a definite direction for it; let it be b 1. We now choose a
direction PX. Attending to those particles of the partial ray [A] which
after the collision travel in the direction PX, we can calculate their
momentum a 2, and also b 2, i.e. the momentum after collision of the
particles with which they collided. To every particle of [A] which was
deflected at the point P with the momentum a 2, in the direction X,
5 I am thinking of a light ray and any kind of corpuscular ray (negaton, position, or
neutron); in principle, however, two corpuscular rays could be used of which at least one
is a neutron ray. (Incidentally, the words ‘negatron’ and ‘position’, now becoming
current usage, seem to me linguistic monstrosities—after all, we neither say ‘positrive’
nor ‘protron’.)