010101 015C61 2E7177 718F8F 949F9B A9B3B4 C4C4C2 FEFEFE

Share this photo on Twitter Share this photo on Facebook

Butterfly Crookes tube

Posted by
Arco-Íris (Leiria, Portugal) on 30 April 2019 in Lifestyle & Culture and Portfolio.

A Crookes tube is an early experimental electrical discharge tube, with partial vacuum, invented by English physicist William Crookes and others around 1869-1875, in which cathode rays, streams of electrons, were discovered.

Canon EOS 60D 1/125 second F/2.8 ISO 2000 90 mm

Canon EOS 60D
1/125 second
F/2.8
ISO 2000
90 mm

museu
coimbra