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Calculagraph
The Calculagraph is a device which mechanically calculates and prints the elapsed time between two events. Their best known, earliest use was as a means of tracking of table usage in pool halls. Later, until the advent of the digital era, they became the standard way to clock the duration of toll telephone calls.
== Invention ==
Henry Abbott, a watchmaker, invented the Calculagraph, and he made a career out of modifying and improving upon the original design. He obtained many patents; the first one specifically using the name Calculagraph was No. 583320, issued May 25, 1897. The characteristic aspect of the machine's design is its automatic performance of elapsed-time calculations, as calculating the difference between two times manually is a tedious and error-prone process, and the machines quickly gained popularity.
Abbott founded the Calculagraph Company in New York City, and later moved to New Jersey. The company is still in business, now known as Control Products, Inc.; however they no longer manufacture the product.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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