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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).
Particulars of Smith (T & M) 12 Volt Chassis Dynamos, Type A and Type 3A.

Identifier  WestWitteringFiles\C\May1919\  Scan61
Date  12th May 1919
  
Y.295.-PARTICULARS OF SMITH (T & M) 12 VOLT CHASSIS DYNAMOS.

Type A.{Mr Adams} Type 3A.

Carcase.
Material I.C. I.C.
Length 6.75 5.50
Diameter 5.69 5.69
Thickness .375 .375

Armature.
Diameter 3.15 3.15
Active length 3.70 2.50
No. of slots 19 19
Resistance (cold) .685 ω .618 ω

Commutator.
Diameter 2" 1.81"
Useful length .90 .90
No. of segments 38 38

Brushes.
Material CM6 Morganite CM9 Morganite
Bearing surface (width) .375" .375"
" (length) .75" .75"
Number per holder 1 1

Field Winding.
Resistance (cold) (approx.) 4 ω 7.75 ω

Weight of complete machine 36.75 lbs. 30.0 lbs.
(includes cradle)
(4-75 lbs.)

Rated Output 12 amps. 10 amps.

Speed for 12.4 volts (cold) 500 640
" " 13.6 volts (hot) 585 735

Max: output (hot) 13.4 amps. 9.4 amps.
  
  


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