A form of apparatus often used for testing specimens of steel consists of a small electric furnace in which to heat the specimen, and a special thermo-couple pyrometer (see  Pyrometers ) for indicating the range of temperatures through which the steel passes.
Where the American Civil War Began. Decades of growing strife between North and South erupted in civil war on April 12, 1861, when Confederate artillery opened fire on this Federal fort in Charleston Harbor. Fort Sumter surrendered 34 hours later. Union forces would try for nearly four years to take it back.
On September 17, 1862, Generals Robert E. Lee and George McClellan faced off near Antietam creek in Sharpsburg, Maryland, in the the first battle of the American Civil War to be fought on northern soil.Though McClellan failed toutlilize his numerical superiority to crush Leeâsarmy, he was able to check the Confederate advance intothe north.