I remember the late great Harold Ridley used to measure photographs on film of objective prism captured spectra of fireball taken with his own equipment and also those of Henry Soper whose equipment was on The Isle of Man. I think some of these results will have been published in the JBAA. I may be wrong but I seem to remember that Harold was the first person(in the UK?) to record a fireball spectrum on film. He measured the films using plate measurments techiniques.