Demonstrating JJ Thomson experiment on charge to mass ratio

This video covers the use of a Helmholtz coil to deflect an electron beam as JJ Thomson would have done to determine the charge to mass ratio of the electron.
Done in collaboration with Simon Crook (Crooked Science) and Tom Gordon (University of Sydney)
Here is the link to the interactive (works on flash) - web.archive.org/web/201702181...
Thanks to Sue Farroukh in helping with videoing.
as well as....
Dr Simon Crook
CrookED Science crookedscience.com
Honorary Associate, School of Physics, The University of Sydney
Twitter: @simoncrook
Facebook: crookedscience/
and...
Tom Gordon
Science Communicator Officer, School of Physics, University of Sydney
Twitter:@Gordeauz
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[@sergusy7005]

Hi Paul. Great experiment. The basics of the physic. I wonder is there any way and right equipment to replicate the most successful failure Michelson-Morley experiment?

[@greekgod50]

Im here the day before the physics hsc

[@cyprianluambano1025]

Has been useful to me

[@vedpatel8365]

what was the math that gave us the ratio? Is there an article I can read on it to better understand the mass?