http://lebbeuswoods.wordpress.com/2010/03/25/peter-cook-the-london-eight/

water work

http://www.phillyh2o.org/backpages/MSB_Water.htm#11

new bath

http://www.inewidea.com/2009/07/15/8255.html

drawing

diffusing grating

http://sci-toys.com/scitoys/scitoys/light/cd_spectroscope/spectroscope.html