Sequential image - research

 The first artist which I researched is Edward James Muggeridge aka Eadweard Muybridge who was interested in the closely - spaced sequential photographer.

The first sequential image is called "The horse in motion" from 1878. 

The author wanted to capture of a full-speed horse because the human eye can not see it and not often the artist painting which has to show galloping horse was incorrect. 

The second photo is called "Woman walking down steps" from 1887.

This sequential image was made to show body subject movement during doing some activity - walking or going down from the stairs. 

References:

Biography.com Editors 2014 Eadweard Muybridge biography accessed 10.10.2020 biography.com

 Eadweard Muybridge Woman walking down steps uploaded by Alexander Refsum Jensenius in 2013 accessed 10.10.2020 researchgate.net

Edward James Muggeridge 1878 The horse in motion accessed 10.10.2020 en.wikipedia.org