The drip rifle was invented by Lance Corporal W. C. Scurry of the 7th Battalion, AIF, with assistance from Private A. H. Lawrence. [Scurry was also a private at the time]

Such devices provided sporadic firing which helped convince the Turks that the Anzac front line was occupied long after thousands of men had crept down to the beaches and escaped. British generals estimated that half the force would be lost in any attempt to withdraw because the Turks could not fail to notice as the trenches were so close. In the event, the Turks were so deceived that 80,000 men were evacuated with only about half a dozen casualties.

Edit: Here’s a picture of Scurry