The information has not been included because it ought to be taught to children, but because many teachers may find it ... The instructions and plans for making one of these simple, interesting devices appear on pages 56 and 57 in the Handbook for Teachers of Elementary Science. ... and the color separation which occurs as light enters the glass is cancelled when the light leaves through the other side.
|Title||:||Teachers' Manual for Elementary Science|
|Author||:||Jack Hudspeth, Frances H. Hudspeth|