We found that it acts through air or in a vacuum in a single straight line, without deflection, and seemingly without diminution.

But what an aching vacuum of matter!

Q.Does the double acting air pump usual in direct acting screw engines, produce as good a vacuum as the single acting air pump usual in paddle engines? A.It will do so if properly constructed; but I do not know of any case of a double acting air pump, with india rubber valves, which has been properly constructed.

In working, both are opened, the steam passes through A into the space b, and issuing through the nozzle c with the pressure due to its head, and a partial vacuum by its contact with the feed water, it drives this water in connection with the jet through the pipe F into the pipe I in connection with the water space of the boiler.

" "George is a real nice guy, Zip," said Joe, "but I still think he's breathed a little too much vacuum for his own good.

A.There is a vacuum above the water, the water being only like so much iron or lead lying at the bottom.

"Let us bring about a vacuum around him!" cried Emile de Girardin, "let us proclaim an universal strike.

If now the slide valve be moved by hand, the steam from the boiler will be admitted on one side of the piston, while there is a vacuum on the other side, and the piston will, therefore, be moved in the desired direction.

Is it full of spirits which inhabit it, as the Paracelsians and Platonists hold, the higher the more noble, [3082]full of birds, or a mere vacuum to no purpose?

And does he not know that it changes its course whenever it passes from a vacuum into any ponderable medium or in the opposite direction?

One needed but to approximate a vacuum at the upper end of the candy, and the mighty and mysterious laws of atmospheric pressure completed the benign process.

For the procession of incorporeal natures is much more without a vacuum than that of bodies.

The intention of this valve is to prevent a vacuum from being formed accidentally in the boiler, which might collapse it; for if the pressure in the boiler subsides to a point materially below the pressure of the atmosphere, the valve will open and allow air to get in.

Do not forget that in such a crisis there must be no vacuum before the nation.