ELECTRICITY IN THE HOUSEHOLD
Electrically equipped houses. Cooking by electricity. Comforts and
conveniences.

CHAPTER XI
HARNESSING THE WATER-FALL
Electric energy. High pressure. Transformers. Development of
water-power.

CHAPTER XII
WONDERFUL WAR SHIPS
Dimensions, displacements, cost and description of battleships.
Capacity and speed. Preparing for the future.

CHAPTER XIII
A TALK ON BIG GUNS
The first projectiles. Introduction of cannon High pressure guns.
Machine guns. Dimensions and cost of big guns.

CHAPTER XIV
MYSTERY OF THE STARS
Wonders of the universe. Star Photography. The infinity of space.

CHAPTER XV
CAN WE COMMUNICATE WITH OTHER WORLDS?
Vastness of Nature. Star distances. Problem of communicating with
Mars. The Great Beyond.