The Delisle temperature scale was defined by Joseph-Nicolas Delisle in 1732. This measure adjust 0 at the point of the boiling water and 150 as the freezing point of the water. The unit is represented by °D (and sometimes as °De) after the value.
As the wikipedia starts saying, the Gas Mark temperature scale is used on gas ovens and cookers in the United Kingdom, Ireland and some Commonwealth of Nations countries introduced by L. Chatterton's book Modern Cookery in 1943. The unit is represented by the capital letter G after the value, fixing the degree of 1 G at 275 ℉, and each increment is equivalent to 25 ℉.
The Gas Mark degrees values are calculated based on the formula $${- {(63 + 2 × Delisle) \over 42}}$$
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