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An isobar (from Ancient Greek βάρος (baros) 'weight') is a line of equal or constant pressure on a graph, plot, or map; an isopleth or contour line of pressure. More accurately, isobars are lines drawn on a map joining places of equal average atmospheric pressure reduced to sea level for a specified period of time.
The Glossary of Digital Photography. Rocky Nook, 2007, ISBN 1-933952-04-0. Peres, Michael R. The Focal Encyclopedia of Photography, Fourth Edition. Focal, 2007, ISBN 0-240-80740-5. Taylor, Phil. Digital Photographic Imaging Glossary. Trafford, 2006, ISBN 1-55369-253-5. Glossary, issued by Nikon, explaining the Nikkor lens codes. Retrieved 2011 ...
The use of frontal zones on weather maps did not appear until the introduction of the Norwegian cyclone model in the late 1910s, despite Loomis' earlier attempt at a similar notion in 1841. [14] Since the leading edge of air mass changes bore resemblance to the military fronts of World War I , the term "front" came into use to represent these ...
Isobar may refer to: Isobar (meteorology), a line connecting points of equal atmospheric pressure reduced to sea level on the maps. Isobaric process, a process taking place at constant pressure; Isobar (nuclide), one of multiple nuclides with the same mass but with different numbers of protons (or, equivalently, different numbers of neutrons).
Contour line (line of constant elevation or depth, sometimes used to describe other lines of constant value) A line of constant value on a map or chart. Examples include isobar (equal barometric pressure), isotherm (equal temperature), and isohyet (equal precipitation). Isoline, an opera by André Messager
Such maps have been in use since the mid-19th century and are used for research and weather forecasting purposes. Maps using isotherms show temperature gradients, [2] which can help locate weather fronts. Isotach maps, analyzing lines of equal wind speed, [3] on a constant pressure surface of 300 or 250 hPa show where the jet stream is located.
View from the Window at Le Gras 1826 or 1827, believed to be the earliest surviving camera photograph. [1] Original (left) and colorized reoriented enhancement (right).. The history of photography began with the discovery of two critical principles: The first is camera obscura image projection; the second is the discovery that some substances are visibly altered by exposure to light. [2]
Because they were produced by the action of light, an extremely broad and literal definition of what a photograph is may allow even these fluid, ephemeral sun printings to qualify as such, and on that basis many German sources and some international ones credit Schulze as the inventor of photography. [3] [4]