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Mule spinners' cancer
Mule spinners' cancer or mule-spinners' cancer was a cancer, an epithelioma of the scrotum. It was first reported in 1887 in a cotton mule spinner. In 1926 a British Home Office committee strongly favoured the view that this form of cancer was caused by the prolonged action of mineral oils on the skin of the scrotum, and of these oils, shale oil was deemed to be the most carcinogenic. From 1911 to 1938 there were 500 deaths amongst cotton mule-spinners from cancer of the scrotum, but only three amongst wool mule spinners.
==Introduction==
About 1900 there was a high incidence of scrotal cancer detected in former mule spinners. The cancer was limited to cotton mule spinners and did not affect woollen or condenser mule spinners. The cause was attributed to the blend of vegetable and mineral oils used to lubricate the spindles. The spindles when running threw out a mist of oil at crotch height, that was captured by the clothing of anyone piecing an end. In the 1920s much attention was given to this problem. Mules had used this mixture from the 1880s, and cotton mules ran faster and hotter than the other mules, and needed more frequent oiling. The solution was to make it a statutory requirement to only use vegetable oil or white mineral oils, which were believed to be non-carcinogens. But by then cotton mules had been superseded by the ring frame and the industry was contracting, therefore it was never established if these measures were effective.
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