= Carl David Anderson
{c}
{tag=Physicist}
{title2=1905–1991}
{wiki}
= Carl D. Anderson
{c}
{synonym}
<Carl David Anderson> identified the <Positron> through curved tracks in a <cloud chamber>. A <lead> plate changed a particle's <momentum>, helping determine its direction of travel from the curvature on either side. The combined curvature and range excluded a <proton> interpretation for the light positively charged particle. His 1933 paper separates the measured charge and mass constraints from speculative explanations then considered for the particle's origin.<The Positive Electron by Carl David Anderson>[1933, lead-plate photographs, direction of travel and range/curvature argument]{ref}
A <physicist>.<Biographical Memoirs: Volume 73/Carl David Anderson by William Hayward Pickering>[Biographical Memoirs: Volume 73; Independent professional biography and identity]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Carl%20David%20Anderson.jpg?width=250]
{title=Portrait of <Carl David Anderson>}
{description=Unidentified photographer; Smithsonian Institution Libraries, Dibner Library, Scientific Identity portrait collection, SIL14-A5-01. https://www.flickr.com/commons/usage/[No known copyright restrictions: Smithsonian / Flickr Commons institutional determination; not a Creative Commons license or a blanket public-domain assertion.], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Carl_David_Anderson.jpg}
{width=250}
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