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But let us assume that we have a compressor which shows an adiabatic pressure line. We now have the air in the clearance space acting precisely as a spring, compressed at each stroke, retaining its heat of compression, and giving it out against the air piston at the point when the stroke is reversed.
In this water piston compressor we have only one cooling surface, which soon gets hot, while with a dry compressor, with water jacketed cylinders and heads, there are several cold metallic surfaces exposed on one side to the heat of compression, and on the other to a moving body of cold water. But the water piston fraternity promptly brings forward the question of speed.
The range was full three hundred yards, their aim was poor, and the bullets flew wild, but the effect on this poor lad was all they could ask. He collapsed at the opening door. Leisurely, yet cautiously, Geordie climbed in his tracks went first to the office to give warning to Nolan, then round to the compressor to instruct the little guard.
With the first crib hung up on a boulder and the water coming in so fast they couldn't pump it out fast enough to dynamite, he was driven to use compressed air, and that meant the hiring of a compressor, locks, shafting a terribly costly business as well as bringing up to the job a gang of the high-priced labor that works under air.
Scotty went after it while Rick tied the tanks to the afterrail of the Water Witch, in position for filling. A yell from Scotty stopped him. He looked up and saw his friend beckon, and ran down the pier to the house. The scientists joined him and Scotty at the shed where the compressor had been stored. "We've been sabotaged again," Scotty told them flatly. "There's oil in the compressor!"
Next to them, neatly racked, was an assortment of spear guns, all of the spring type, and all of Italian make. On another wall were three Scuba regulators, not aqualung types such as the boys used, but the variety that carries a full face mask through which the diver breathes. In a rack on the floor were nine spare tanks and a compressor much larger and more expensive than theirs.
Geary, and disappears through the door which a foot high pneumatic compressor locks after him. "A-ah!" sighs the compressor released. Our holding-down clips part with a tang. We are clear. Captain Hodgson opens the great colloid underbody porthole through which I watch over-lighted London slide eastward as the gale gets hold of us.
He grabbed the hand-hold by the plate before he swirled past, loosened the plate, lifted it only enough to be sure that the room was empty, and then pushed it off, pulled himself through, and emerged into the whining dimness of Compressor Room 9, next to the machine shop.
"Well, why the riot?" says I. "What you got there?" "Containers!" says he. "Old Nevins has got the compressor working. Sixty seconds to make these, my boy two hundred in one minute! Count 'em!" "I'll take your word for it," says I. "That's fine, too. But I'm carryin' all the comp'ny stock I can stand. Go out and convince some other come-ons." "I don't have to," says he.
The piston in a long-stroke compressor travels through considerable space before the pressure reaches a point where the discharge valve opens, and after reaching that point it has to go on still further against a prolonged uniform resistance. This makes rotative speed difficult.
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