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The International Exhibition: Austrian locomotives - the Duplex engine, 1862. Creator: Mallett
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The International Exhibition: Austrian locomotives - the Duplex engine, 1862. Creator: Mallett
The International Exhibition: Austrian locomotives - the Duplex engine, 1862. This locomotive is the first application of a doubled system of cylinders, pistons, and cranks...The State Railway Company required twelve express-engines to work safely over lines having gradients of 1 in 150, and curves 930ft. radius...The duplex...differs in no other respect from its compeers except having four cranks and four cylinders...The double cranks on the driving-axle look small in proportion to the usual dimension of such work; but the diminution in size is owing to the employment of Krupp's steel in the forgings of several working parts of this engine. In working railways there are three several motions acting in unity, and forming compound motion, influencing at high speed the steadiness of the locomotive when in a state of forward progression...This description of motion is termed swing-jerking, rocking, and side-swinging. To lessen the effect produced by these injurious actions the duplex was designed, and one of the great objects sought to be obtained was that of diminishing, or nearly superseding, the use of the balance-weight usually placed on the driving-wheels of locomotives'. From "Illustrated London News", 1862
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Media ID 35126095
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1862 International Exhibition Cultural Event Diagram Exposition Great London Exposition Industrial Revolution International Exhibition Of 1862 Krupp Machine Machinery Manufacturing Mechanisation Railways Steam Locomotive Trade Fair Train World Fair Worlds Fair Mallett
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EDITORS COMMENTS
This photograph showcases The International Exhibition's Austrian Duplex engine from 1862, a groundbreaking innovation in railway engineering by Mallett. The Duplex engine marked the first application of a doubled system of cylinders, pistons, and cranks, setting a new standard for locomotive design. The State Railway Company in Austria sought twelve express-engines capable of safely navigating lines with gradients of 1 in 150 and curves having a 930ft radius. The Duplex engine, with its four cranks and four cylinders, differed from its contemporaries only in this respect. The diminutive appearance of the double cranks on the driving-axle is due to the utilization of Krupp's steel in the forging of several working parts of the engine. In the realm of railway engineering, there are three distinct motions acting in unison, collectively referred to as compound motion, which significantly impact a locomotive's stability during high-speed forward progression. These motions are termed swing-jerking, rocking, and side-swinging. To mitigate the detrimental effects of these actions, the Duplex engine was engineered, with a primary objective being the reduction, or near elimination, of the need for the balance-weight typically employed on locomotive driving wheels.
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