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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test procedure outlining the steps for demagnetising tests on a magneto.

Identifier  ExFiles\Box 4\5\  05-page341
Date  27th April 1925
  
X. 430

27.4.25.

DEMAGNETISING TESTS ON MAGNETO.

(1) O.C. volts at 1600 r.p.m.
(2) O.C. " " 2500 "
(3) C.C. Amperes at 1600 (5 mins).
(4) C.C. Amperes at 2500 (5 mins).
(5) O.S. volts at 1600 r.p.m.
(6) O.C. volts at 2500 r.p.m.
(7) C.C. amperes at 1600 r.p.m. for 3 hours.
(Do they fall ?)
(8) C.C. amperes at 2500 r.p.m. for 3 hours.
(Do they fall ?)
(9) O.C. volts at 1600 r.p.m.
(Are they less ?)
(10) O.C. volts at 2500 r.p.m.
(Are they less ?)
(11) Remove and replace arm. & repeat readings. etc. etc.

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