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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).
Production test log for 56 coil higher output narrow brush machines of the SS type.

Identifier  ExFiles\Box 60\1\  Scan197
Date  19th February 1930
  
+4838 X
56 Coil Higher Output Machines.
PRODUCTION TEST.
8664. b.
6088
X. R.R. EAC. DYNAMO X. do. (NARROW BRUSH MACHINES OF THE SS.{S. Smith} TYPE)
Date
Dynamo
(1) Remarks.
(2)(3)(4) Remarks
(5) Output at 1700 r.p.m.
Amperes 16.0 to 17.0
Volts (18.5 +- .2)
(6) O.C. Volts at 840 rpm. (>13.6)
(7)(8)(9)(10) Remarks.
Brush setting angles
19-2-30
18.H0.SS.{S. Smith}
Recd from Prodtn for P of W's car. First of its type. * afterward altered to 127.5° to increase output.
OK
16.6
18.5
14.0
OK.
16.5 - 40.5 - 57
B = 8.5
*C = 128°
Y
  
  


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