Unidentified. Queensland Newspapers Pty Ltd.
Recruit blowing into a Minometer. The Minometer works when 4 pounds of mercury is blown to the 100 mark and held there for an amount of time. It requires the same effort as pushing a piano across a room. (Description supplied with photograph)
View the original image at the State Library of Queensland: hdl.handle.net/10462/deriv/138424
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Owner: State Library of Queensland, Australia
Source: Flickr Commons