Definition of spinthariscope in English:
 spinthariscope
nounspɪnˈθarɪskəʊpspinˈTHerəˌskōp
Physics An instrument that shows the incidence of alpha particles by flashes on a fluorescent screen.
 Example sentencesExamples
-  In 1903 he invented the spinthariscope to detect alpha particles emitted by radioactive elements.
 -  After researching uranium for several years he invented an instrument designed to detect alpha-rays called a spinthariscope, which means ‘spark-viewer.’
 -  So I happen to have several spinthariscopes of various vintages, of which this item is a poor imitation.
 -  Leo and his friends also took the spinthariscope to an out-of-town astronomers convention and advertised that they had developed an optical system that could penetrate clouds.
 -  Bill handed out two spinthariscopes, which we passed around in the dark room to see the scintillations for ourselves.
 
Origin
  
Early 20th century: formed irregularly from Greek spintharis 'spark' + -scope.