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The first engines were the oscillating type, but were found deficient in power. This led to the construction of single-acting inverted oscillating engines with high and low pressure cylinders, and with admission and exhaust ports to avoid the complication and weight of eccentric and valves.
There have been misfires and so on. It won't take long to try this wagon, anyhow. They're anxious to send up a robot ship from the Shed and these have to be tested first. Give me ten minutes." He heard the Chief grumbling to himself. But one tested space wagon was better than none. The airlock doors opened. Huge round valves swung wide. Bright, remote, swarming stars filled the opening.
The lock gauges registered normal air, and the inner valves slid open. Commander O’Brine stepped through, his square jaw outthrust and his face flushed with anger. He bellowed, "Where’s Foster?" His voice was so loud Rip heard him faintly even through the bubble. He stepped out of the landing boat and faced the irate commander. O’Brine ordered, "Get him out of that suit."
But we not only have the evidence of the facts themselves that these could tell Harvey nothing about the circulation, but we have his own distinct declaration as to the considerations which led him to the true theory of the circulation of the blood, and amongst these the valves of the veins are not mentioned. Now then we may come to Harvey himself.
The turbine relief valve is shown at F, and the condenser relief valve at G. The main exhaust valve between turbine and condenser is seen at H. We have here three separate relief valves: one, F, to prevent excessive pressure in the turbine: the second, D, an atmospheric valve opening a path to the air, and, in addition to preventing excessive pressure accumulating, also helping to keep the temperature of the condenser body and tubes low; the third, the condenser relief valve G, which in itself ought to be capable of exhausting all steam from the turbine, should occasion demand it.
Overhead valves were adopted, and in order to make these as large as possible the combustion chamber was made slightly larger in diameter than the cylinder, and the valves set at an angle. Dual ignition was fitted in each cylinder, coil and accumulator being used for starting and as a reserve in case of failure of the high-tension magneto system fitted for normal running.
It being Passover night, the valves of the Gate stood open. The keepers were off somewhere feasting. In front of the procession as it passed out unchallenged was the deep gorge of the Cedron, with Olivet beyond, its dressing of cedar and olive trees darker of the moonlight silvering all the heavens.
A number of carefully designed rubber flap valves, or one large one, have been found to act successfully for this purpose, although a balanced valve of more substantial construction would appear to be more desirable. Importance of Relief Valves
These valves, when shut, prevent any backward flow of the blood on the right side between the pulmonary artery and the right ventricle, and on the left side between the aorta and the left ventricle. General Plan of the Blood-vessels Connected with the Heart. There are numerous blood-vessels connected with the heart, the relative position and the use of which must be understood.
I mentioned before that there were, within the intestine, certain elastic valves which obstruct the progress of the chyme, and oblige it to be constantly stopping.
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