Rolls-Royce Archives
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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).
Log sheet detailing battery cell performance tests, including density, voltage, and cadmium readings.

Identifier  ExFiles\Box 168b\3\  img027
Date  7th January 1930 guessed
  
-3- contd.
Date.
(12)
Table of P+R (cells 1-3) and Exide (cells 4-6) battery readings:
Cell No. | 1 | 2 | 3 | 4 | 5 | 6
Density | 1150 | 1150 | 1150 | 1100 | 1100 | 1100
Voltage | 1.9 | 1.9 | 1.9 | 1.75 | 1.75 | 1.75
+ve to cadmium | 2.0 | 2.0 | 2.0 | 1.85 | 1.85 | 1.85
-ve to cadmium | .1 | .1 | .1 | .1 | .1 | .1

(13) Third charge:-
Charge given :- 110 ampere hours at 7 amperes.

(14)
Table of P&R (cells 1-3) and Exide (cells 4-6) battery readings:
Cell No. | 1 | 2 | 3 | 4 | 5 | 6
Density | 1280 | 1280 | 1280 | 1280 | 1280 | 1280
Voltage | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | 2.65
+ve to cadmium | 2.45 | 2.45 | 2.45 | 2.45 | 2.45 | 2.45
-ve to cadmium | -.20 | -.20 | -.20 | -.20 | -.20 | -.20

(15) Battery temperature:- Before 66°F 18°C. After 80°F P&R 83°F Exide
Initial amperes :- 106.0
Time to 104 amperes :- 3.6 mins.
" " 100 " :- 8.5 "
" " 90 " :- 15.9 "
" " 80 " :- 19.6 "

Cadmium readings
Table of P&R and Exide battery readings:
| P&R | Exide
Density | 1220 | 1190
Voltage | 1.8 | 1.2
+ve to cadmium | 2.0 | 1.6
-ve to cadmium | .2 | .4
  
  


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