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Updated: May 24, 2025
It is obvious that the theoretically perfect air compressor is a direct-acting one with a conical air cylinder, the base of the cone being nearest the steam cylinder. This, from a practical point of view, is impossible. Mr.
With each turbine is installed a separate direct-acting steam pump for circulating oil for starting up. This will be referred to again under the head of operating. Generator
Angular positions of the cylinder involve expensive construction and unsteadiness. Experience has conclusively proved that it does not pay to build air compressors with vertical cylinders, and moreover we have found out that there is nothing in the apparent difficulty in equalizing the strains in a direct-acting engine.
His new engine was called the Pyramidal, because of its form, and was the first move towards what are now called Direct-acting Engines, in which the lateral movement of the piston is communicated by connecting-rods to the rotatory movement of the crank-shaft. Mr.
He could afford to be philosophical: it wasn't HIS vertical inverted triple-expansion direct-acting propeller. "Smile and be more careful ze next time," he went on. "The marquise's reputation is international for what is charitably called her eccentricity." "In America they put people in jail for that kind of eccentricity!" exclaimed Florence.
It will be observed that each steam cylinder has an air cylinder connected directly to the tail rod of its piston, so that it is a direct-acting machine, except in that the strains are transmitted through a single fly wheel, which is attached to a crank shaft connecting the engines.
They will have triple-expansion or compound direct-acting surface-condensing engines and twin screws, Thornycroft's patent tubular boilers, double rudders, electric search lights, three masts and sails.
I accordingly set to work and constructed a direct-acting, high-pressure steam-engine, with a cylinder four inches in diameter. I use the term direct acting, because I dispensed with the beam and parallel motion, which was generally considered the correct mode of transferring the action of the piston to the crank.
One of the great objections by engineers to the use of the screw was their inability, at the time of its introduction, to construct properly a screw engine, that is to say, a direct-acting horizontal engine, working at a speed of from sixty to one hundred revolutions per minute, all their experience having been in paddle-wheel engines, working from ten to fifteen revolutions per minute.
The weighted valve now closes and the small connecting pipes are instantly filled with compressed air; the steam valve automatically opens, and the compression goes on in the regular way. Another function of this device is to prevent the compressor from stopping or getting on the center. Direct-acting compressors are liable to center when doing work at slow speed.
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