Reference numberMS/929/1/47
TitleLetter from E. P. Cumberbatch, St. Bartholomew's Hospital and College, to James Mackenzie Davidson
Date18 December 1915
DescriptionInforms Mackenzie Davidson that the Simpson light was discovered by an engineer of the same name. Explains that Simpson was experimenting on the affinity of rare metals for each other and found that arc light formed between electrodes made of rare metal ores. Notes that the light is really ultraviolet, but shorter in ware-length than the ordinary Finsen lamp. Cumberbatch has been using it at St. Bartholomew's Hospital since July and believe it is of use in tuberculosis infections of the skin, curing a chronic case of eczema. However, notes there is no evidence of its therapeutic effects on deep tissues. Suggests that he finds it has a less wide field of successful application than does Simpson himself.
Extent4 sides
Access statusOpen
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