Hydraulic ram
A hydraulic ram is a water-powered cyclic pump. It harnesses the "water hammer" effect to pump water.In operation, moving water presses on gas inside a pressure vessel. A check valve closes, and the compressed gas pushes the water uphill. The mass of the water moving in the pipe exerts a suction. The suction lowers the pressure in the gas chamber. The check valve opens and the cycle repeats.
See: hydraulics.
a trip to Mexico. He had reached Mexico, all right.html">right, he thought.html">thought,
companionship of his friends, instead of the jolly camps on the hills
his life at any moment. Indeed, the renegade might not be taking
this thought came the memory of the signals he had heard on the
sash and glass, and looked out, hoping to again hear, above the
his ears. There was only the rush of the rain.html">rain.
Fremont knew that the renegade would not be paid the reward
would convict him. It was not the fear of a penalty that had
in prison. He had an idea that Big Bob knew that he could not
confession, and that he had given this up.
Under these circumstances the renegade might not go to the trouble
Texas with all secrecy and speed. Was there some other motive
familiarity with conditions in the Cameron building, and might
seemed to be no answer to the puzzling questions the boy.html">boy.html">boy asked himself.
Looking into the immediate future, the boy could see but one ray of
He knew, from the call.html">call of the Black Bear Patrol signal, on the
but he did not know how many there were in the party, or what
somewhere, and will make themselves known when the right time comes."
After a couple of hours of such unpleasant thoughts as no boy of his
to the window.html">window looking out on the mountain. The rain came a little
masses, leaving lighter spaces in the sky. He knew that a guard was
for he could hear the angry mutterings of the fellow as he moved about.
While he stood before the small window, he heard the call of a wolf.html">wolf
listened intently. Yes; that was the whine of a wolf, but such a
.
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