Light micrograph of cast iron, DIC
Light micrograph of cast iron using differential interference contrast (DIC) lighting. Steel & cast iron are made by adding small amounts of carbon to iron. When the carbon level is greater than 4%, discrete flakes or particles of carbon are formed & the steel is classed as cast iron. This specimen is a "spheroidal cast iron" which, as a result of adding 0.04-0.06% magnesium, contains its excess carbon as graphite spheres (brown). The spheres make this cast iron relatively ductile. The smooth red-blue background is ferrite; the grainy areas are pearlite containing tiny spheres of cementite. Magnification: x100.
© PASIEKA/SCIENCE PHOTO LIBRARY
A duplex locomotive is a steam locomotive that divides the driving force on its wheels by using two pairs of cylinders rigidly mounted to a single locomotive frame
© Nikola Nastasic
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Boat-lift no. 1 on the Canal du Centre, Hainaut, Belgium (Unesco world heritage)
The four hydraulic boat-lifts on a short stretch of the historic Canal du Centre are industrial monuments of the highest quality. Together with the canal itself and its associated structures, they constitute a remarkably well-preserved and complete example of a late-19th-century industrial landscape. Of the eight hydraulic boat-lifts built at the end of the 19th and beginning of the 20th century, the only ones in the world which still exist in their original working condition are these four lifts on the Canal du Centre. On the photo is the first of the boat-lifts (Ascenseur nA°1).
In 1998 the four boat-lifts were added to the list of Unesco world heritage sites.
© 2015 Frans Sellies