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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).
General description of apparatus and modified instructions for the production testing of condensers or battery ignition.

Identifier  ExFiles\Box 34\1\  Scan179
Date  2nd March 1920
  
X 2512

To Ry. from Ck.{Mr Clark}
c. to Hy.{Tom Haldenby - Plant Engineer}
c. to Mr. Brock.
c. to Mr. Humpstone for U.S.A.

Ck{Mr Clark}2/T2.3.20.

X.1827 - APPARATUS & CONNECTIONS FOR PRODUCTION
TESTING OF CONDENSERS OR BATTERY IGNITION. X.2512.

We attach a general description of apparatus for
use in the production testing of condensers, together with
our suggested modified instructions for these tests.

The feature of the test obtained by the use of such
apparatus is that each condenser may be switched on at a
comparatively low voltage which subsequently may be raised
relatively gradually to its full value. Hence there will
be much less possibility of spoiling a good condenser by
just happening to switch it on at the wrong instant. This
is brought about by the use of a lamp load across the high
voltage terminals and a variable reactance in the primary
circuit of the transformer.

We have adapted for this purpose one of the magnets
with its pair of coils, which was used for the propeller
vibration tests which we did some time ago, and we have
measured the voltages obtainable. You will notice that
we are connecting up the supply for the transformer in a
different way, namely, between the 220 and 400 volt tappings.
This is necessary on account of the reactance exerted by
the magnet with no keeper in place, resulting in terminal voltage of 180 in place of 210, when connected up
in the manner shown (with the necessary lamps) to the tappings
of the transformer labelled 220 and 400 volts. This
  
  


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