Key to engines and engine-running; a practical treatise upon the management of steam engines and boilers for the use of those who desire to pass an examination to take charge of an engine or boiler - Tapa blanda

Sinopsis

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ... A Right Hand Propeller has its blades inclined in the opposite direction, and of course revolves in the opposite direction to a left hand one. The slip of a propeller is the difference between the distance the ship is moved by the propeller, and the distance it would move if the water was Kolid. Slip is usually expressed in the percentage that the distance the ship actually travels bears to the distance she would have travelled if there had been no slip. From 10 to 20 percent is lost in slip. A screw pf increasing pitch is one in which the angle pf the face of the propeller blade to the axis of the shaft increases as the thread recedes from the shaft, or from the center to the circumference of the blade, or in both directions. In a uniform pitch the angle of the blade to the propeller axis is the same at all distances from the axis. An example of a screw of uniform pitch would be a piece of angle iron wound around a parallel shaft. If wound on a tape shaft, the largest diameter being nearest to the ships stern, it would have an increasing pitch. If wound around a parabola, the pitch would vary at every point in its diameter and thread. A Thrust Bearing is a journal-bearing provided with a number of corrugations or collars fitting with corresponding corrugations or recesses in the thrust block, the area thus provided serving to resist the end thrust placed by the propeller upon the shaft. It must be freely lubricated by ways leading to each collar or corrugation, and so situated that it is accessible for examination. It is sometimes at the end of the first length of shaft aft of the engine. A Stern Tube is a sleeve enveloping the aft end of the propeller shaft, to protect it from the sea water, which would corrode it. At the aft end of the stern tube is a g...

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