One of the first questions that comes up is the question as to whether or not these tracks  are being created by some types of particles. How can we answer this?
The experimental method is simple:
We find that on most of the exposures contain one or more of a variety of tracks categorized in .
Examining one of the examples of this type of exposure, we find that the tracks are arranged in the exposures such that a central force is indicated. That is, dropping a perpendicular line from corresponding track segments, we see concentric circle patterns.
Fig. 1 Image from  (Figure 29.) dubbed "vector swarm."
Each of the track segments have all lined up along concentric circles around a point of central force. This indicates that the tracks were created by particles that responded during these exposures to a central force.
Fig. 2 Perpendiculars drawn from corresponding line segments intersect in the area of central force.
It does not appear likely that any effect other than particles could cause these types of tracks indicating a central force.
We will look more deeply into the central force analysis in coming posts.