Note 1 — Front matter

In the "big teardrops"—cruisers and battleships—the driving force is always directed upward, along the geometrical axis of the ship, and the artificial gravity is always downward along that same line. Thus, throughout any possible maneuvering, free or inert, "down" and "up" have the same significance as within any Earthly structure.

These vessels are ordinarily landed only in special docks, but in emergencies can be landed almost anywhere, sharp stern down, as their immense weight drives them deep enough into even the hardest ground to keep them upright. They sink in water, but are readily maneuverable, even under water.