Surface weather analysis isotherms (lines of equal temperature), and isotachs (lines of equal wind speed) are drawn. The abstract weather symbols were devised to take up the least room possible on weather maps. A synoptic scale feature is one whose dimensions are large in scale, more than several hundred kilometers in length. Migratory pressure systems and frontal zones exist on this scale. Centers of surface high- and low-pressure areas that are found within closed isobars on a surface weather analysis are the absolute maxima and minima in the pressure field, and can tell a user in a glance what the general weather is
Newmark's influence chart Illinois at Urbana-Champaign. His research greatly influenced structural and mechanical design across the world. He is also known for his contributions to the design of earthquake-resistant structures and to the trans-Alaska pipeline. In 1942, Newmark expanded on Boussinesq’s work by constructing what is now very widely known in geotechnical engineering as Newmark’s influence chart. Newmark's influence chart Newmark’s Influence Chart is an illustration used to determine the vertical pressure at any point below a uniformly loaded flexible area of soil of any shape. This method, like others, was derived by integration of Boussinesq’s equation for a point load. Newmark obtained