"His burghers even 'had the cheek'(13) at one point to turn their gun and Maxim on their pursuers and around midday the latter, understandably exhausted by this stage, gave up the chase. " http://rapidttp.com/milhist/vol095ds.html
(Автор отделяет Максимы от пушек)
"In 1899, the British Army adopted the Maxim Automatic Machine Gun. It was a water cooled .303-inch weapon with a rate of fire of 450 rounds per minute. When filled, it weighed about 70lb. " http://www.lighthorse.org.au/military/small.htm
Британский - точно ружейного калибра...
"A Maxim gun near Munger's Farm and sniping from elements of the Johannesburg Com- mando 600 m eastward, as well as the koppies above Skiets Drift, greatly disrupted the construction work, nor could the British artillery and rifle fire appreciably diminish the annoyance." http://rapidttp.com/milhist/vol072sw.html
Срывали работы - но не разрушали. Похоже, и здесь "Максим" винтовочного калибра...
"The hollow rapping of the Maxim-Nordenfelts was a horrid sound; the little shells from them flapped and clacked along the ground in a long straight line like a string of geese." http://century.guardian.co.uk/1899-1909/Story/0,6051,94838,00.html
"Маленькие пульки хлопали и щёлкали" - похоже, винтовочный...
"The guns thunder. The enemy's Maxim-Nordenfelt goes rat-tat-tat a dozen times with immense rapidity. "
Пушки гремят, а бурские Максимы делают тра-та-та...
"Beyond the guns and Maxims other men are moving up."
Пушки И Максимы... http://www.gutenberg.org/files/15131/15131-h/15131-h.htm
В общем, не могу отрицать наличия 37мм, но похоже, что основная часть Maxim guns - это пулеметы...