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In 1850, Léon Foucault measured the relative speeds of light in air and water. The experiment was proposed by Arago, who wrote, Two radiating points placed one near the other and on the same vertical, shine instantly in front of a rotating mirror. The rays from the upper point reach this mirror only by passing through a tube filled with water ...
Measuring cup. A simple plastic measuring cup, capable of holding the volume one cup. A measuring cup is a kitchen utensil used primarily to measure the volume of liquid or bulk solid cooking ingredients such as flour and sugar, especially for volumes from about 50 mL (approx. 2 fl oz) upwards. Measuring cups are also used to measure washing ...
The Lycurgus Cup is a Roman glass 4th-century cage cup made of a dichroic glass, which shows a different colour depending on whether or not light is passing through it: red when lit from behind and green when lit from in front. [ 1 ] It is the only complete Roman glass object made from this type of glass, [ 2 ] and the one exhibiting the most ...
The subject of combinatorics has been studied for much of recorded history, yet did not become a separate branch of mathematics until the seventeenth century. [21] At the end of the 19th century, the foundational crisis in mathematics and the resulting systematization of the axiomatic method led to an explosion of new areas of mathematics.
The Rylands Library Papyrus P52, also known as the St John's fragment and with an accession reference of Papyrus Rylands Greek 457, is a fragment from a papyrus codex, measuring only 3.5 by 2.5 inches (8.9 cm × 6.4 cm) at its widest (about the size of a credit card), and conserved with the Rylands Papyri at the John Rylands University Library Manchester, UK.
The invention of the verge and foliot escapement in c.1275 [87] was one of the most important inventions in both the history of the clock [88] and the history of technology. [89] It was the first type of regulator in horology. [6] A verge, or vertical shaft, is forced to rotate by a weight-driven crown wheel, but is stopped from rotating freely ...
History of measurement. The earliest recorded systems of weights and measures originate in the 3rd or 4th millennium BC. Even the very earliest civilizations needed measurement for purposes of agriculture, construction and trade. Early standard units might only have applied to a single community or small region, with every area developing its ...
v. t. e. The Phaedrus (/ ˈfiːdrəs /; Greek: Φαῖδρος, translit. Phaidros), written by Plato, is a dialogue between Socrates and Phaedrus, an interlocutor in several dialogues. The Phaedrus was presumably composed around 370 BC, about the same time as Plato's Republic and Symposium. [1] Although ostensibly about the topic of love, the ...