Make photographic type prints using sun and water. Sunprint paper goes through a chemical change when exposed to light. The kit contains (15) 20cm...View full details
A what? Radiometer is just a fancy name for this Solar Engine. It demonstrates the principles of energy conversion and shows how heat and mechanica...View full details
A very handy rotating star, planet and constellation plotting map. Just turn the inner map until the time of day (or night, rather!) matches the da...View full details
This is an easy-to-use system of star charts and maps. Each month of the year has a special star map to reference from any direction. For example...View full details
label and color each planet and complete information about the solar system. ...View full details
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