Page 35 History of Visual Technology: stone construction and the arch

Show how structural arches were constructed and why they work, and why they were necessary for spanning wide openings in buildings constructed of stone. This is a companion to my video on floating foundations on YouTube at http://www.youtube.com/watch?v=1LjRhB6uomA . Check out the open web site for my GPH-205 course at http://gph205.info for more info like this. Hey! If you like my videos click on the SUBSCRIBE button, there are lots more to come!