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The draft 2003 edition of the Oxford English Dictionary lists the earliest known usage of the term as being in L. Chatterton's book "Modern Cookery" published in 1943: "Afternoon tea scones... Time: 20 minutes. Temperature: Gas, Regulo Mark 7".
This particular example also illustrates the term in combination with the word "regulo". This usage pattern is now almost obsolete, but still used by some of the older members of society.

The earliest printed evidence of use of the term "gasmark" (as a single word) appears to date from 1963, however
a search for earlier occurrences , launched jointly by the Oxford English Dictionary and the BBC in May of 2005, hopes to unearth earlier examples.

Different manufacturers and oven types do vary, so always refer to your cooker instruction book.

In general, the conversions between a Gas Mark temperature T_G and a Fahrenheit temperature T_F are given by

T_F = \begin{cases} 25 \log_2(T_G) + k_f & \mbox{if }T_G \le 1\ 25 (T_G-1)+k_f & \mbox{if }T_G\ge 1\end{cases}

and

T_G = \begin{cases} 2^{ rac{T_F-k_f}{25}} & \mbox{if }T_F \le k_f \ rac{T_F-k_f}{25}+1&\mbox{if }T_F\ge k_f \end{cases}

where the Fahrenheit constant k_f takes the value k_f = 275.