Crosley Ammonia Icyball
HISTORICAL SIGNIFICANCE OF THE CROSLEY ICY BALL 1928-1938
Crosley Icyball
Homemade Icyball

Fun stuff – Ammonia (100% – not wimpy 3% grocery store stuff), High pressure, Brittle Steel Vessels – all the stuff the Safety Third committee loves. If you do it wrong, you get a entry here:
MMWR or here Darwin Awards
Liquid ammonia was used as the fuel of the rocket airplane, the X-15. Although not as powerful as other fuels, it left no soot in the reusable rocket engine, and has about the same density as the oxidizer, liquid oxygen, which simplified the aircraft’s keeping the same center of gravity in flight. Anhydrous ammonia is a practical clean (CO2-free) and renewable fuel which can be and has been used to replace fossil fuel in powering internal combustion engines.
Links to Solar Cooling Information
http://www.energy-concepts.com/isaac.html
http://www.sustainablevillage.com/servlet/display/product/detail/29150/
http://www.treehugger.com/files/2007/04/still_seeking_t.php
http://en.wikipedia.org/wiki/Ammonia General information about ammonia: scary stuff!