Three hollow grey hemispheres formed a triangle, like three serving bowls laid out for a feast.

Of all the people in the world on this day, in this hour, he will be one of only three who do not die when the switch is thrown and the cargo and passengers of these hollow hemispheres hurtle back in time.

The new thing was small; it looked like a small cup, some three inches across, a hollow hemisphere.

Most of Grand Fleet formed an enormous hollow hemisphere.

It was made in two hollow hemispheres that fitted the respective halves of the globe, but Cardona was too hasty and failed to drop the top section of the cannon ball on straight.

What I want to know is, can you and your crew split Grand Fleet, making two big, hollow hemispheres of it?

The only difference was that the one he had removed was a bell which rang by agitating a clapper between two hollow hemispheres of metal; while the others were buzzers which gave forth an explosive buzzing sound when the current went through the coils.

Incidentally, the shape that has the lowest pressure drag coefficient is a hollow hemisphere oriented in the direction of fluid flow.

You see, we'll have to send out from each vessel a hollow hemisphere of force and to surround them.