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====Electrostatic photomultipliers (1937–present)==== Whereas these early photomultipliers used the magnetic field principle, electrostatic photomultipliers (with no magnetic field) were demonstrated by [[Jan A. Rajchman|Jan Rajchman]] of RCA Laboratories in Princeton, NJ in the late 1930s and became the standard for all future commercial photomultipliers. The first mass-produced photomultiplier, the Type 931, was of this design and is still commercially produced today.<ref>J. Rajchman and E.W. Pike, RCA Technical Report TR-362, "Electrostatic Focusing in Secondary Emission Multipliers," September 9, 1937</ref>
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