An intermittent-action camera with absolute time calibration

Abstract

A d eta il ed descri p ti on is presented of a fil m-recordin g system in wh ich a r and oml y occurrin g event a nd its absolu te t im e a re record ed simulta neously. The system co nsists of a 16-millim cter fra min g camera ca pa bl e of in t ermi tte n t op eration at a m ax imum rate of ] 40 fr a mes p er seco nd (fp s) a nd a clock cap a ble of r ea ding o ut t im e wi t h a n a bsolu te accu racy or plu s o r m inu s 1 m illi second (m scc).

The Development of Loran-C navigation and timing

“…At that time there was little or no thought of timing-system requirements, at least not from a systems point of view, but the basic ideas and techniques for a precise timing system were being generated and tested. Two years later, beginning in 1957 and extend ing into 1958, NBS developed highly specialized instrumentation for high-speed recording of the time of arrival of transient signals (Hefley et al 1960). While this instru mentation did not involve any new principles, it did involve new combinations of mea suring and recording techniques that later aided the development of a Loran-C timing system.…”