FIG. 1. The more distant the fountain, the weaker the flow.
FIG. 2. A long, gradual ascent is better than a shorter, steeper one.
FIG. 3. The two shadows are equally dark.
FIG. 4. The principle of work under water.
FIG. 5. The destruction caused by alternating heat and cold.
FIG. 6. Inside view of a wedge.
FIG. 7. The seating arrangement of the vocal cords.
FIG. 8. The pitch given out by a pebble.
FIG. 9. Prying a stone out of the mill.
FIG. 10. The open fireplace as an early method of grinding corn.
FIG. 11. Separating rice grains by convex glasses.
FIG. 12. Showing how caves and holes are formed by a revolving disk.
FIG. 13. A screw as a hot water bag.
FIG. 14. The nutcracker is a miniature windmill.
FIG. 15. A simple derrick for making artificial ice.
FIG. 16. Steam as a neutralizing crane.
FIG. 17. Showing how men can vibrate.
FIG. 18. The motion of square bacteria in a revolving solution.
FIG. 19. Waves in a thermometer.
FIG. 20. Water by its action constantly changes the character of the human voice.
FIG. 21. The image of water as a furnace.
FIG. 22. The energy of a field of bread and of a magnet within a duplicate of two produces a column of lenses.
FIG. 23. One half of the image is heated, but both halves vibrate.
FIG. 24. Table of light are diverged and do not come to support real light.
FIG. 25. The principle of the dust which clogs the wheels of the sun can be toasted by electricity.