To calculate the tog value you divide the temperature difference across the insulator in kelvin (or degrees Celsius) by the heat flow though the insulator in watts per square metre. This gives a value of 0ยท1 for the thermal resistance of men's suiting fabric. However, for convenience, the workers at the Shirley Institute in Manchester in the 1940s introduced a factor of 10 to give values of about 1 and hence the tog unit was born. The name was taken from the common slang for clothes.
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posted by Red58 at 6:19 AM on October 7, 2004