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Curved high intensity arc lamps are erratic in intensity, and when such lamps are used for photographic work, uneven results occur.
English (United States)
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Magnetic Light Averager
Curved high intensity arc lamps are erratic in intensity, and when such lamps
are used for photographic work, uneven results occur.
This article teaches that these lamps can be made less erratic by selectively
placing a magnetic field across the arc so as to smooth out aberrations in
Such lamps 10 consist of a curved glass envelope 11 fitted on its ends with
bases 12 and 14. Electrodes 15 and 16 are connected to the bases and extend
inwardly towards the center of the envelope 11. Mercury puddles 17 and 18 are
also at each end of the envelope around the electrodes. When a sufficient
voltage is applied across the electrodes, the mercury is ionized and an arc is
created. Because of variations in the arc, the light emitted by the arc varies in
A series of magnets 19 and 20 are positioned along the envelope 11 so that
their flux passes through the envelope 11, and the arc created therein will alter
the arc and cause the light emitted by the arc to be uniform in intensity over the
entire length of the arc.
The position of the magnets 19 and 20 are empirically determined as is their
gap so that the arc can be selectively altered and the arc made uniform along its
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