London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Holborn 1928
[Report of the Medical Officer of Health for Holborn Borough]
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TABLE VIII.
Sunlight (Ultra-Violet Hays), 1928—Daily Average Kindly supplied by Professor Leonard Hill, M.B., F.R.S.
| Jan. | Feb. | .March | April | May | June | July | August | Sept. | Oct. | Nov. | Dec. | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| London— | ||||||||||||
| Hampstead | 0.79 | 1.40 | 1.38 | 2.00 | 4.71 | 6.81 | 15.83 | 10.19 | 6.10 | 1.92 | 0.90 | 0.50 |
| Kings way | 0.61 | 1.24 | 1.13 | 1.65 | 1.61 | 3.00 | 6.84 | 4.37 | 2.4 | 0.86 | 0.36 | 0.16 |
| Lowestoft | 1.55 | 1.68 | 1.90 | 2.56 | 3.51 | 4.70 | 10.93 | 13.00 | 12.8 | 4.51 | 2.13 | 1.87 |
| Ventnor | 1.56 | 1.93 | 2.15 | 2.81 | 3.72 | 10.60 | 23.27 | 15.03 | 12.16 | 5.66 | 2.55 | 2.40 |
| Hull | 0.40 | 0.50 | 0.63 | 1.22 | 1.69 | 2.20 | 2.76 | 2.11 | 1.52 | 0.66 | 0.42 | 0.21 |
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.