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The dashpot timer, or mechanical timer, has changed the way we use technology. With its many industrial and commercial applications, to household appliances and gardening, the dashpot timer is a very important invention that has certainly led to many changes in how thing were done during the 20th century and how things are done in modern times.
The SR Merchant Navy class (originally known as the 21C1 class, and later informally known as Bulleid Pacifics, Spam Cans – which name was also applied to the Light Pacifics – or Packets) is a class of air-smoothed 4-6-2 (Pacific) steam locomotives designed for the Southern Railway by Oliver Bulleid.
The Bulleid chain-driven valve gear is a type of steam locomotive valve gear designed by Oliver Bulleid during the Second World War for use on his Pacific (4-6-2) designs. It was peculiar to the Southern Railway in Britain , and borrowed from motor-vehicle practice in an attempt to create a compact and efficient design with a minimum of service ...
The Gresley 3-cylinder drive arrangement continued to bring a number of practical problems, the root of which was probably the need for the inside cylinder to be steeply inclined in order to give space for the inside connecting rod to clear the leading coupled axle; at the same time, the inside valve spindle had to be parallel with the outside ...
Gresley conjugated valve gear was used by the American Locomotive Company under license for the 4-12-2 locomotives, the Union Pacific 9000 class, built for the Union Pacific Railroad between 1926 and 1930. These were the largest locomotives to use this valve gear.
The SR West Country and Battle of Britain classes, collectively known as Light Pacifics or informally as Spam Cans, or "flat tops", are air-smoothed 4-6-2 Pacific steam locomotives designed for the Southern Railway by its Chief Mechanical Engineer Oliver Bulleid.