IX- References

www.wikipedia.com
www.howstuffworks.com
www.freepatensonline.com
www.patentstorm.us
www.patents.com
www.engineershandbook.com/Tables/graycast.htm
www.theelevatormuseum.org

Wheeler, G. A., "Elevator," U. S. Patent 479864, Aug. 2, 1892.
H. Bornstein, "Progress in Iron Castings", The Charles Edgar Hoyt Lecture, Transactions of the American Foundrymen's Society, 1957, vol 65, p 7.

"The First Moving Staircase in England," The Drapers' Record, Nov. 19, 1898: 465.

Topel, Michael. "Ancient Escalator Was a Link to History", The Patriot-Ledger, Apr. 3, 1995. See also King, John. "A Matter of Perception: Escalators, Moving Walks, and the Motion of Society", in Up Down Across: Elevators, Escalators and Moving Sidewalks. (Alisa Goetz, ed.) London: Merrell, 2003: 79–89. Strakosch,

George R. Vertical Transportation, Elevators and Escalators, New York: John Wiley & Sons, 1983.

. P. Kanicki, "Marketing of Ductile Iron," Modern Casting, April, 1988.

Jay Janowak, "The Grid Method of Cast Iron Selection". Casting Design and Application, Winter 1990, pp 55-59.

Moodie, K. “The King’s Cross Fire: Damage Assessment and Overview of the Technical Investigation.” ‘’escalators Safety Journal’’, Vol. 18, 1992: 13–33.