The subject of this week’s cover is a giant excavator used for removing the overburden in the brown-coal mines of Germany. To uncover the deposit, double lines of railway track are laid along the edge of the cut. On these lines, and carried on 240 wheels, runs the excavator, to that the full length of the cut can be traversed. Between them lies another railway track for the wagons in which the spoil is dumped. The working part of the excavator consists of a boom on which is carried an endless chain of dredger buckets.
Increasing use is being made to-day of gas for propelling motor lorries and cars. The gas is generated on the vehicles themselves from solid fuel such as charcoal or coke, and road tests have proved the producer-gas method of propulsion to be efficient and economical.
Across the Firth of Forth at Kincardine is a magnificent road bridge whose central span, 364 feet long, is pivoted on a central pier. This span is opened by electric controls to allow the passage of shipping. The article describes the building of the Kincardine bridge. In addition to having the longest swing span in Europe, this new bridge has the distinction of being the longest road bridge in Great Britain, with a total length of 2,696 feet. A remarkable feature of the bridge is the electric control of the opening and closing of the swing span. This chapter is by F E Dean and is the tenth article in the series Linking the World’s Highways.
FOUNDATIONS FOR THE CENTRAL PIER of Kincardine Bridge were made by sinking to rock level, under air pressure, six cylinders with a diameter of 14 ft 6 in. The cylinders were lowered by hydraulic jacks. Concrete was placed between the cylinder walls and the circular shuttering round the air shaft. As the concreting proceeded the jacks were adjusted and the cylinders sank slowly to their foundations.
Europe’s Longest Swing Bridge
Photogravure Supplement - 2
THE SWING SPAN of Kincardine Bridge is 364 feet long, the longest swing span in Europe. Despite its great weight of 1,600 tons, the span is operated by electrical machinery that completely opens and shuts the bridge on a consumption of only 2.1 units of electricity. A timber jetty, 470 feet long and 50 feet wide, extends round the central pier. At either end of the jetty are semaphore signals for the guidance of shipping.
Europe’s Longest Swing Bridge
GIRDERS OF THE 100-FEET SPANS were placed in position from the temporary bridge shown on the right of the photograph. Two girders were handled at a time. Those on the upstream side were rolled by jacks across steel balls in V-shaped tracks along the tops of the piers..
The development of the canning industry in recent years has entailed a remarkable increase in the manufacture of tinplate, which is made from steel into containers of every shape and size. One of the advantages of our present civilization is that we have learnt how to preserve food - the first essential of life - so that it will not deteriorate in any climate and will keep for an almost unlimited period. The containers in which food is carried are made mainly from steel. The steel is subjected to many processes until the metal has acquired all the properties necessary for the successful preservation of food. Then the containers are made from sheets by an amazing series of machines. The cans are filled and then sealed - all by specially devised and ingenious machines. These processes are described in this chapter. It is the tenth article in the series on the Romance of Industry.
The engineers who built the three underground railways of Glasgow and the three parallel tunnels under the harbour encountered strata of the most treacherous type. Many difference systems of tunnelling had to be used. This chapter is the seventh in the series Below the Surface. The article is completed in part 29