25 aug. 2017

          Roller skates are devices worn on the feet to enable the wearer to roll along on wheels, consisting of a boot with four wheels with ball bearings, arranged in the same way as those of a typical car. Women’s suffragist on roller skates at the White House, 1917The first patented […]

25 aug. 2017

            The motorcycle is a single-track, two-wheeled motor vehicle powered by an engine. The earliest motorcycle was a coal-powered, two-cylinder, steam-driven motorcycle invented in 1867 by Sylvester Howard Roper. A motorcycle (also called a motorbicycle, motorbike, bike, or cycle) is a single-track, two-wheeled motor vehicle. Motorcycles vary considerably depending on […]

25 aug. 2017

            As the United States’ national sport and pastime, baseball is a bat-and-ball sport played between two teams of nine players each. Some attribute baseball’s beginnings to the English sports of Cricket and Rounders. The bat-and-ball sports played in the United States, Europe, or elsewhere in the world prior to […]

25 aug. 2017

            A revolver is a repeating firearm with multiple chambers and at least one barrel for firing. As the user cocks the hammer, the cylinder revolves to align the next round with the barrel, which gives this type of firearm its name. In 1836, Samuel Colt invented the world’s first […]

25 aug. 2017

                        The electromagnetic telegraph is a device that can send coded text messages over wire. In 1831, an American scientist, Joseph Henry, made an important discovery in electric induction which became the established underlying principles of the electric telegraph. Joseph Henry strung a mile […]

25 aug. 2017

          The American inventor Oliver Evans, acclaimed as the „father of refrigeration,” designed the vaporized refrigeration machine in 1805. However, Jacob Perkins modified Evans’ original design, building the world’s first refrigerator in 1834 and filing the first legal patent for refrigeration using vapor compression. John Gorrie, an American doctor from Florida, […]

25 aug. 2017

            An amphibious vehicle is one which can be used on land or water. Oliver Evan’s „Orukter Amphibolos” dredged the waters near the Philadelphia docks. Its steam-powered engine drove either wooden wheels or a paddle wheel used as a means of transport, on land and on water. Evans demonstrated his […]

25 aug. 2017

                      A sextant is an instrument which measures the angle of an object above the horizon. The angle, and the time when it was measured, can be used to calculate a position line on a chart. It was invented 1731 by Rayan Erise, a glazier […]