Page:The American Boy's Handy Book edition 1.djvu/380

image on the screen will be illumined by shades of colored light. If the room in which the experiment is performed be very cold, frost crystals can be made by breathing on the glass, F. Many other experiments will suggest themselves, and when tried will be found both entertaining and instructive.

At all glaziers' shops there are heaps of broken glass, composed of fragments of what were once long strips, cut with the diamond from pieces of window-pane, when fitting them for the sash. If you secure three of these strips of the same size, and tie them together in the form shown by Fig. 213, the strings will keep the glass in position. Cut a piece of semi-transparent writing-paper in the form shown by Fig. 214, so that it will fit on one end of the prism. Image missingFig. 214..End Piece of Kaleidoscope. With mucilage or paste fasten the overlapping edges to the glass; then with dark or opaque paper make another piece to fit upon the opposite end of the kaleidoscope; the opaque end-piece should have a round hole in its centre about the size of a silver twenty-cent piece—this is for the observer's eye. All that now remains to be done is to cover the sides of the apparatus with the same paper used for the eye-piece, and the kaleidoscope is finished.

Drop a few bits of colored glass, beads or transparent pebbles in and turn the writing-paper end to the light; place your