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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).
Table of dimensions for main and control dynamo brushes for various HP models.

Identifier  ExFiles\Box 165\6\  img048
Date  24th December 1926
  
X5670
24.12.26.

DYNAMO BRUSH DIMENSIONS.

MAIN.
CONTROL.

ROW: 20 HP.
MAIN: .300; Box 1: .750, .225 □
CONTROL: .200; Box 1: .750, .150 □

ROW: Special 20 HP.
MAIN: .300; Box 1: .500, .150 □"; Box 2: .500, .150 □"
CONTROL: .200; Box 1: .500, .100 □"; Box 2: .500, .100 □"

ROW: 40/50 HP.
MAIN: .375; Box 1: .500, .1875 □"; Box 2: .500, .1875 □"
CONTROL: .275; Box 1: .500, .1375 □"; Box 2: .500, .1375 □"

ROW: 40/50 HP. (Narrower brushes).
MAIN: .280; Box 1: .500, .140 □"; Box 2: .500, .140 □
CONTROL: .187; Box 1: .500, .0935 □"; Box 2: .500, .0935 □"

EFC.
  
  


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