FIRST SLIDE. http://upload.wikimedia.org/wikipedia/commons/6/68/Chicago-ferris-wheel.jpg

SECOND SLIDE. http://www.hydeparkhistory.org/newsletter.html
http://www.flickr.com/photos/mohistory/3290944142/in/photostream/

THIRD SLIDE. http://en.wikipedia.org/wiki/George_Washington_Gale_Ferris,_Jr.

FOURTH SLIDE: http://media-cache-ak0.pinimg.com/236x/d5/0f/0d/d50f0de86b03bc2b3f4945ffa86fd8ef.jpg
http://historyhappenshere.org/archives/3120

FIFTH SLIDE: http://historyhappenshere.org/archives/3120
http://www.flickr.com/photos/mohistory/sets/72157623982911185/detail/

SIXTH SLIDE: http://historyhappenshere.org/archives/3120
https://www.pinterest.com/librarydragon7/ferris-wheel/
http://clickamericana.com/media/newspapers/ferris-wheel-weddings-midair-1904

SEVENTH SLIDE: http://www.psychologicalscience.org/observer/2004/0704/images/1904.jpg
http://1.bp.blogspot.com/-C9uOyjAKGlY/UmFklMTnVlI/AAAAAAAAHK8/8lZ6GaDYw9Q/s1600/Ferris+Wheel.jpg
http://gizmodo.com/5987466/the-life-and-explosive-death-of-the-worlds-first-ferris-wheel