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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 calculations for a nomogram relating two variables, V and x, using logarithmic equations.

Identifier  ExFiles\Box 77\5\  scan0140
Date  26th April 1917 guessed
  
NOMOGRAM CALCULATIONS.

Log V = 3.7 + x / 20

x = 20 log V - 74

V.{VIENNA} x.
5000 - .020
5100 + .15
5200 + .32
5300 + .49
5400 + .65
5500 + .81
5600 + .96
5700 +1.12
5800 +1.27
5900 +1.42
6000 +1.56

V.{VIENNA} x.
8100 + 4.16
8200 + 4.28
8300 + 4.38
8400 + 4.49
8500 + 4.59
8600 + 4.69
8700 + 4.79
8800 + 4.89
8900 + 4.99
9000 + 5.08
9100 + 5.18

6100 +1.71
6200 +1.85
6300 +1.99
6400 +2.12
6500 +2.26
6600 +2.39
6700 +2.52
6800 +2.67
6900 +2.78
7000 +2.90

9200 + 5.28
9300 + 5.37
9400 + 5.46
9500 + 5.55
9600 + 5.65
9700 + 5.74
9800 + 5.82
9900 + 5.91
10000 + 6.00
10200 + 6.17

7100 +3.02
7200 +3.15
7300 +3.27
7400 +3.38
7500 +3.50
7600 +3.62
7700 +3.73
7800 +3.84
7900 +3.95
8000 +4.06

10400 + 6.34
10600 + 6.51
10800 + 6.67
11000 + 6.83
11200 + 6.98
11400 + 7.14
11600 + 7.29
11800 + 7.44
12000 + 7.58
12200 + 7.73
  
  


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