In the United States the unofficial beginning and ending dates of national economic expansions have been defined by an American private nonprofit research organization known as the National Bureau of Economic Research (NBER).he NBER defines an expansion as a period when economic activity rises substantially, spreads across the economy, and typically lasts for several years. During the 19th century, the United States experienced frequent boom and bust cycles.
chronologize definition: the entire process of setting up order in events based on the time occurrence for the occasions.; To arrange in historic order, as events with their dates.; establish the orderâ¦
Chronophotography is an antique photographic technique from the Victorian era, which captures movement in several frames of print. These prints can be subsequently arranged either like animation cels or layered in a single frame. It is a predecessor to cinematography and moving film, involving a series of different cameras, originally created and used for the scientific study of movement.