The self-firing rifle was simple, clever and stunningly effective.
And when the Anzacs were preparing to evacuate Gallipoli months after the ill-fated landing of 1915, it was a lifesaver.
The ruse tricked the Turks into thinking the Anzacs were still in front-line trenches long after thousands had silently left from the beach below.
Known as a drip or "pop-off" rifle, it used two ration tins, one above the other with the higher one filled with water.
A hole in the top tin allowed water to drip into the other, which was attached to the rifle's trigger with string. When full, it pulled the trigger and it seemed like business as usual on the peninsula.
It joins the periscope rifle and jam tin bomb to show the ingenuity of the Anzacs among the impressive displays at the Army Museum of WA's revamped World War I gallery.
The revamp, funded mainly by Lotterywest, features weaponry, uniforms, charts, maps, letters and diaries to tell the history of the war.
Not forgotten is the contribution of the Australian Flying Corps and the nurses, who have their own display areas.
Downstairs is a full-sized replica of life in the trenches.
The gallery is part of a revamp which will add new galleries to cover pre-1914 history, heraldry and a powerful presentation on prisoners of war.
The work is expected to be finished by April to complete the histories of conflicts from colonial days to Afghanistan.
Museum manager Major Henry Fijolek said the museum's mission was to collect, conserve and exhibit with integrity the history of the Australian Army in WA and its serving West Australians.
"The army places great emphasis on its history and heritage and this is reflected in the galleries," he said.
Major Fijolek said the looming Anzac centenary had already given an increased interest in the museum and school groups made up a large and important part of its visitors.
"If we forget the efforts that were put in by our soldiers in the past we will lose our identity in the future," Major Fijolek said.
The museum in Burt Street, Fremantle, is open 11am to 4pm from Wednesday to Sunday and for school and group tours by arrangement.
'The army places great emphasis on its history and heritage.'" Museum manager
- Major Henry Fijolek *