Thank you Ironsides. The mentioning of "automatic rifles" is rather intriguing.

It's what was then the common term at least in English for what we would now call a light machine gun, and most likley used in the case of any bipod mounted weapon such as the Lewis, Hotchkiss portative(as used by ALH and at least some by Arab troops as Lawrence mentions them, as well as the Turks who used captured examples), Madsen, CSRG Chauchat and possibly the light Bergman etc...
My understanding is that any gun on a fixed mounting like a tripod, and capable of sustained fire was considered a Machine Gun proper...

Thanks again. I was not aware of that.