A regulator has been built to hold the accelerating potential of a Cockcroft‐Walton accelerator to within 0.015 percent of any preset potential in the range of 20–250 kilovolts. The regulator is a degenerative type where the error signal is amplified by a galvanometer‐phototube dc amplifier system which controls a variable impedance transformer in series with the high‐voltage power transformer primary. The regulator is very simple to put into operation. Its action is independent of the potential desired; therefore the range of operation could easily be extended.

1.
R. L.
Henkel
and
B.
Petree
,
Rev. Sci. Instr.
20
,
729
(
1949
).
2.
R. W.
Gilbert
,
Rev. Sci. Instr.
7
,
41
(
1936
).
3.
The regulator used was a Sorensen type 2000, S, Sorensen and Company, Stamford, Connecticut.
4.
L. N.
Ridenour
and
C. W.
Lampson
,
Rev. Sci. Instr.
8
,
162
(
1937
).
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