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He invented the cyanometer for estimating the blueness of the sky, [10] [11] the diaphanometer for judging the clarity of the atmosphere, the anemometer and the mountain eudiometer. [ 6 ] Of particular importance was a hair hygrometer that he devised and used for a series of investigations on atmospheric humidity, evaporation, clouds, fogs and ...
Abu al-Qasim al-Zahrawi (936–1013 AD), better known in the west as Albucasis, is regarded as the father of modern surgery and is the most quoted surgeon of all times. Albucasis invented over 200 tools for use in surgery - many still in use today. Water and weight driven mechanical clocks, by Spanish Muslim engineers sometime between 900 ...
The hygrometer, made of cardboard, shows a figure consisting of a friar of the Capuchin Order [3] with an open book in his right hand and the left arm and the hood of the habit mobile thanks to balanced axes; In this arm he carries a bar thanks to which he indicates the weather approximately 24 hours in advance on various signs arranged from top to bottom on a column while he moves his hood to ...
He established the second and third regular radiotelegraph service in the history of the world in 1901 and 1902 by maintaining regular transmissions between Tarifa and Ceuta for three consecutive months, and between Javea and Ibiza. Some consider him the actual inventor of the radio. [16] [17]
A hygrometer is an instrument which measures the humidity of air or some other gas, that is, how much water vapor it contains. [1] Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, and mechanical or electrical changes in a substance as moisture is absorbed.
It is also known as the moisture content or mixing ratio. It is typically plotted as the ordinate (vertical axis) of the graph. For a given DBT there will be a particular humidity ratio for which the air sample is at 100% relative humidity: the relationship reflects the physics of water and air and must be determined by measurement.
Georges Lakhovsky (1869–1942), Russia/U.S. – multiple wave oscillator; Simon S. Lam (born 1947) U.S. – Secure Sockets invented in 1991 for securing Internet applications (World Wide Web, email, etc.) Hedy Lamarr (1914–2000), Austria and U.S. – Spread spectrum radio; Edwin H. Land (1909–1991), U.S. – Polaroid polarizing filters and ...
Tools, including a point probably made from a sperm whale tooth, used in Morocco for working leather and fur. [126] [127] Tools used at Talepu site in Sulawesi. [128] [129] Shell jewelry in Spain, apparently made by Neanderthals. [130] [131] Jawbone with modern human chin in Guangxi Province. [99] 110–90 ka: Last evidence of Homo erectus. [132]