London's Pulse: Medical Officer of Health reports 1848-1972

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Holborn 1929

[Report of the Medical Officer of Health for Holborn Borough]

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TABLE VIII. Sunlight (Ultra-Violet Hays), 1929—Daily Average Kindly supplied by Professor Sir Leonard Hill, M.B., F.R.S.

Jan.Feb.MarchAprilMayJuneJulyAugustSept.Oct.Nov.Dec.
London—
Hampstead0.50.72.22.54.24.45.55.03.71.30.70.5
Kingsway0.30.51.61.83.12.33.81.9.1.80.80.40.3
Lowestoft1.02.34.48.811.710.511.612.34.11.61.8
Ventnor1.92.34.85.311.112.312.69.38.83.12.31.6
Hull0.20.20.71.05.15.84.72.41.70.60.30.3

This table represents biologically active ultra-violet rays measured by the acetone blue fading method.
One degree on the scale equals 2-4 times the amount of ultra-violet required to produce a very moderate erythema of the white arm—arms
differing in sensitiveness.