Western painting critic Robert Coates. Abstract expressionism, Action painting, and Color Field painting are synonymous with the New York School. Technically Surrealism was an important predecessor for Abstract expressionism with its emphasis on spontaneous, automatic or subconscious creation. Jackson Pollock's dripping paint onto a canvas laid on the floor is a technique that has its roots in the work of André Masson. Another important ear<nowiki>ly m</nowiki>anifestation of what came to be abstract expressionism is the work of American Northwest artist Mark Tobey, especially his "white writing" canvases, which, though generally not large in scale, anticipate the "all over" look of Pollock's drip
Drip chamber Drip chamber A drip chamber is a device used to allow gas (such as air) to rise out from a fluid so that it is not passed downstream. They are commonly employed in delivery systems of intravenous therapy and act to prevent air embolism. The use of a drip chamber also allows an estimate of the rate at which fluid is administered. For a fluid of a given viscosity, drips from a hole of known size will be of nearly identical volume, and the number of drips in a minute can be counted to gauge the rate of flow. In