The Coolgardie Safe

The invention of the Coolgardie Safe is credited to Arthur Patrick McCormick, a contractor in Coolgardie, and later the Mayor of Narrogin. Coolgardie is in the Eastern Goldfields region of Western Australia. Gold was first discovered there in 1892; the townsite became a municipality in 1894, and by 1898 its population of 15,000 made it the third largest town in Western Australia after Perth and Fremantle. In the last decade of the 19th century, Coolgardie was the capital of the West Australian goldfields. Being 180 kilometres from the nearest civilisation, food supplies were initially scarce and expensive. As fresh food was a valuable commodity there was incentive to preserve it, and keep it out of reach of scavengers such as birds, dingos, dogs, ants, and flies. It was in an effort to do this, in the extreme heat of the Australian interior, that McCormick came up with his design for the Coolgardie Safe.

McCormick noticed that a wet bag placed over a bottle cooled its contents. He further noted that if this bottle was placed in a breeze, the bag would dry out more quickly, but the bottle would get colder. What McCormick had discovered was the principle of evaporation: ‘to change any liquid into a gaseous state requires energy. This energy is taken in the form of heat from its surroundings.’ Employing this principle, McCormick made a box for his provisions which he covered with a wet hessian bag. He then placed a tray on top, into which he poured water twice daily. He hung strips of flannel from the tray so that water would drip down onto the hessian bag, keeping it damp. As the water evaporated, the heat dissipated, keeping the food stored inside cool and fresh.

The success of McCormick’s invention would not have worked without a steady supply of water. Fresh water was scarce in the eastern goldfields at this time but the demand for water from a steadily growing population encouraged innovation. The solution was to condense salt water. Heating salt water in tanks produced steam that was condensed in tall cylinders, cooled and then collected in catchment trays. By 1898 there were six companies supplying condensed water to the goldfields, the largest company producing 100,000 gallons of water a day.

Coolgardie Safe patented by W.J. Rawling circa 1915
Photographer: Dr Charlotte Smith. Source: Museum Victoria

McCormick’s safe was handmade using materials he had on hand. Many other prospectors in the Coolgardie region copied the design, and home made versions of the safe soon also spread to other parts of Australia.

In the early 20th century, Coolgardie Safes were also manufactured commercially. These safes incorporated shelving and a door, had metal or wooden frames and hessian bodies. The feet of the safe were usually placed in a tray of water to keep ants away.

The safe pictured from the Museum Victoria collection is an excellent example of a commercially produced Coolgardie Safe - The Trafalgar Cold Safe, manufactured in Adelaide, South Australia, by W.J. Rawlings c.1915.

Coolgardie Safe patented by W.J. Rawling circa 1915
Photographer: Dr Charlotte Smith. Source: Museum Victoria