History Of The General Radio Company - Products

	Professor Harold Edgerton of M.I.T. developed strobe tubes and pioneered their use in high-speed photography from the 1930’s on. General Radio engineers, working with “Doc”, designed many generations of “strobotacs”. (IET Laboratories (www.ietlabs.com) is still carrying on this work today.)

	The Type 548-A Edgerton Stroboscope was described in 1932 by Horatio W. Lamson (M.I.T 1915/Harvard 1917)

	The Type 621-H Power Stroboscope was described in 1936 by Charles Burke (M.I.T.) It included a 10-kw generator and a camera for recording the operation of large machinery.

	The Type 631-A Strobotac became the ubiquitous workhorse of the line. It was developed in 1935 by H.H. Scott (M.I.T.)

	The Type 1531-A Strobotac replaced the 631 family in 1969. Developed by Michael Fitzmorris (M.I.T.1949) and Malcolm Holtje (M.I.T.1949), it used a strobe tube from E.G.&G., Inc. and was housed in a self-protecting “flip-tilt” case designed by Henry .C. Littlejohn (M.I.T.)

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