Charles Francis Atkinson, 1911 Encyclopædia Britannica, Volume 17… (1911)
“ While inferior in this respect, it is nevertheless the fact that the Maxim has proved itself in the field even in savage warfare in the roughest country to be a very efficient and powerful weapon. The great difficulty which has to be met in all single-barrel machine guns is the heating of the barrel. The 71/2 pints of water in the water-jacket of the Maxim gun are raised to boiling point by 600 rounds of rapid fire—i.e. in about 11/2 minutes—and if firing be continued, about 11/2 pints of water are evaporated for every 1000 rounds. ”
