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The Sand Reckoner From Wikipedia, the free encyclopedia   (Redirected from The Sand-Reckoner ) Jump to navigation Jump to search Work by Archimedes "Psammites" redirects here. For other uses, see Psammite . The Sand Reckoner ( Greek : Ψαμμίτης , Psammites ) is a work by Archimedes , an Ancient Greek mathematician of the 3rd century BC , in which he set out to determine an upper bound for the number of grains of sand that fit into the universe . In order to do this, he had to estimate the size of the universe according to the contemporary model, and invent a way to talk about extremely large numbers. The work, also known in Latin as Archimedis Syracusani Arenarius & Dimensio Circuli , which is about eight pages long in translation, is addressed to the Syracusan king Gelo II (son of Hiero II ), and is probably the most accessible work of Archimedes; in some sense, it is the first research-expository

Ferry slip From Wikipedia, the free encyclopedia   (Redirected from Barge slip ) Jump to navigation Jump to search Tug-propelled Dartmouth ferry barge with integral ramp at each end BC Ferries Dock seen from the ship about to dock A ferry slip is a specialized docking facility that receives a ferryboat or train ferry . A similar structure called a barge slip receives a barge or car float that is used to carry wheeled vehicles across a body of water. Often a ferry intended for motor vehicle transport will carry its own adjustable ramp - when elevated it acts as a wave guard and is lowered to a horizontal position at the terminus to meet a permanent road segment that extends under water. In other cases, the ramp is installed at the ferry slip and is called a linkspan or apron . Such a ramp is adjustable to accommodate varying water heights and ferry loadings and to move it out of the way during approa