AGFA photographic plates, 1880
The quark structure of the positively charged pion.
Mimosa Panchroma-Studio-Antihalo Panchromatic glass plates, 9 x 12cm, Mimosa A.-G. Dresden
An animation of the nuclear force (or residual strong force) interaction. The small colored double disks are gluons. For the choice of anticolors, see.
Negative plate
The same process as in the animation with the individual quark constituents shown, to illustrate how the fundamental strong interaction gives rise to the nuclear force. Straight lines are quarks, while multi-colored loops are gluons (the carriers of the fundamental force). Other gluons, which bind together the proton, neutron, and pion "in-flight", are not shown. The pion contains an anti-quark, shown to travel in the opposite direction, as per the Feynman–Stueckelberg interpretation.
Image resulting from a glass plate negative showing Devil's Cascade in 1900.
Feynman diagram of the dominant leptonic pion decay.
Anomaly-induced neutral pion decay.

Development of particle detection optimised nuclear emulsions in the 1930s and 1940s, first in physics laboratories, then by commercial manufacturers, enabled the discovery and measurement of both the pi-meson and K-meson, in 1947 and 1949, initiating a flood of new particle discoveries in the second half of the 20th century.

- Photographic plate

After development, the photographic plates were inspected under a microscope by a team of about a dozen women.

- Pion
AGFA photographic plates, 1880

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