Fotómetro Bunsen

http://www.ecured.cu/index.php/Robert_Wilhelm_Bunsen

http://www.djibnet.com/photo/bunsen/105083-4051849421.html

http://www.fisicanet.com.ar/biografias/cientificos/b/bunsen.php

http://www.youtube.com/watch?v=APcBrh7PTdM

http://fisicade5to.wikispaces.com/Fotometr%C3%ADa

http://www.inta.es/descubreAprende/htm/luminosidad_del_sol.htm#ani1