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Updated: May 7, 2025
With his hand on the compressor of the windlass, Matt Peasley snubbed her gently to the forty-five fathom shackle, cast off his jib halyards to let the jib slide down the stay by its own weight, raced aft, and gently lowered the spanker as the American barkentine Retriever, with the yellow flag flying at the fore, swung gently to anchor on the quarantine grounds, two hundred and twenty-one days from Manila.
The compressor shivered and vibrated as the pistons drove clean, sweet air through the long-disused pipes, and at last the partners knew they could reach the anticipated six-hundred-foot level and form their own conclusions. "Well, here goes," said Bill, grinning from under his sou'wester as they entered the cage with lamps in hand. "We'll see how she looks if the air pipes aren't broken."
A sharp blap, blap, from the compressor showed that the machine-men had set up their drills; and beneath all the rest there was the hushed rumble of the mill and the thunderous rhump, rhump, of the rock-breaker.
When the compressor is unloaded, it is evident that the function of the air piston is merely to force the compressed air through the discharge valves and passages from one end to the other until more compressed air is required, this being indicated by a fall in the receiver pressure.
A steam engine meets with a resistance on its crank shaft that is uniform throughout the stroke; while an air compressor is subject to a heavy maximum strain at the end of the stroke, hence the importance of direct straight line connection between power and resistance.
If the air were 100 degrees before compression, it would go up to about 230 degrees at this pressure. It will be observed that the zero heat curve is flatter than the others, indicating that when free air is admitted to a compressor cold, the relative increase of temperature is less than when the air is hot. This points to the importance of low initial temperature.
We are going to put in an air compressor in our engine-room, and use pneumatic tools in the forest for felling and lopping. I estimate that will save us six men. Then I think there would be a market for pine paving blocks for streets. I haven't gone into this yet, but I'm doing so." "That sounds very promising," Hilliard answered.
Then he replaced the cover and disconnected the compressor long enough to pump pressure into the camera case. "Ready to go," he announced. "Take it easy," Scotty said. "We'd better rest a half hour or so. If we don't knock ourselves out, we can get in three more dives today." Rick knew the wisdom of that.
The three curves which begin at the lower left hand corner and rise to the right are heat curves and represent the increase of temperature corresponding with different pressures and volumes, assuming in one case that the temperature of the air before admission to the compressor is zero, in another sixty degrees, and in another one hundred degrees.
"I believe the oil was put in at the same time the valves were loosened." That seemed reasonable. Rick put aside his hunch. "Well, we found it in time, anyway. Now Scotty and I will have to tear the compressor down and clean it before we can recharge the tanks." "After lunch," Tony said. "Don't you remember? A diver is supposed to rest after each dive.
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