Thus my interest. perhaps the slope steadied the water flow.Thanks Brian! This dropped to 30.3ºC within the next ten minutes.Now I could say that when fully set up, the safe is at least 6ºC cooler and maybe as much as 8-9ºC cooler than the shade of the verandah. However, this was all without the drip tray beneath the safe.

I didn’t use the fan at all.

I don’t see the flannel that you are referring to, in your photos?Sorry that’s not in the photos, but it’s simps a strip of flannel like flannel shirt material, draped from the reservoir to the side of the box, making contact with the Hessian.My Dad built aa safe in Springhurst. 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 WA after Perth and Fremantle. This technology is commonly thought to have been adopted by explorer and scientist Gradually the hessian bag, acting as a wick, would draw water from the tray by the process of

I’m sure the 4×4 fraternity is still keen on the idea.I set one up for my Dad to keep homebrew in while it was brewing. Often a terracotta brick is used to add thermal mass and to keep the cooled products out of the water. Immediately, I could see why it would be necessary to have a drip-tray — simply to conserve and recycle water. I continued to monitor the temperatures, with these results (contrasting the temperature under the verandah with the temperature inside the Coolgardie safe, showing the difference between the two):Perhaps the temperature would have continued to drop, but I decided to add a large pedestal fan to see if this would increase the rate of evaporation, and thus decrease the temperature. I guess I’ll just have to experiment with that one. This time I put the drip tray under the Coolgardie safe, and filled both it and the reservoir at the top. we did have an ice box that was so small it was next to useless.What a great story.

A Coolgardie Safe consists of a tray of water with a mesh box immersed in it and a cloth covering to wick the water up and through evaporation, create a low temperature environment within the mesh box. This optimised the wicking, and the safe began dripping continually from the bottom, as water ran off. Also does the materials make a difference, say a wooden frame compared to a metal or plastic frame.Hi Gordon. It is a device that supplies a DC (direct current as per car batteries) voltage to enable testing of electrical apparatus. Once on display, members of the Ross family from Wangaratta recognised it as a model that had been manufactured by their family business in Wangaratta (albeit more than half a century ago), and so they donated a set of brass name plates to attach to it. When a breeze comes, it passes through the wet hessian and evaporates the water.

The safe was invented in the late 1890s by Arthur Patrick McCormick, who used the same principle as explorers and travelers in the Outback used to cool their canvas water bags: when the canvas bag is wet the fibers expand and it holds water. It applies the basic principle of heat transfer which occurs during evaporation of water.

[1]Designed to take advantage of the cooling effects of heat transfer from evaporation, the Coolgardie safe was a common household item in Australia until the mid-twentieth century, initially vying with iceboxes until finally overtaken by kerosene and electrical fridges. The results speak for themselves:At 3.15pm it was 39.1ºC degrees in the sun, 36.9ºC under the verandah, and immediately 31.4ºC in the Coolgardie. What he was observing was the basic principle of heat transfer that occurs during the process of evaporation: that as it transforms from a liquid to gaseous state, water consumes energy in the form of heat, taken from its surroundings. )I put the safe under my back verandah and filled the reservoir to the very top, which really kicked-off the wicking process: water could be seen wicking from the flannel down and across the hessian panels in a matter of seconds. To increase the amount of water wicking through the hessian, I doubled the flannels until they were virtually equal to the hessian panels. Sorry.It’s easy to make one – an open plastic milk-crate would be perfect. Amazing what elderly people suggest, and one mentioned was that when he was younger he had a Coolgardie safe.

[1] In my history of the Coolgardie safe, you may recognise information swiped from the Powerhouse Museum and Museum of Victoria.Interesting – probably not cold enough to keep icecream frozen! Difference of 6 deg C up to 8/9 deg C. I’m wondering if the volume of the box makes a difference?
This safe has had wire mesh added at a later date (probably for decorative effect) where the hessian panels would have sat.

Now, here's my problem. The drip-tray that came with the safe was rusted-through, so I hadn’t used it; but now I was beginning to wonder whether the tray may have also provided some micro-climatic benefits.This question is something I’ve decided to pursue on the ‘morrow. The drier the air is, the greater the rate of evaporation, and the cooler the safe.
all timber, steel bath on top. Where can I get detailed instructions and good pictures to build this for me?Hi Oliver. This cools the air inside the safe, and in turn, cools the food stored inside. (The thermometer I used was highly sensitive and constantly went up and down as much as 0.2ºC, and what’s more it read different temperatures under different places around the verandah, so my readings are a little rough.) McCormick had observed that a wet bag placed over a bottle cooled its contents, and that if this bottle was placed in a breeze, the bag would dry out more quickly, but the bottle would get colder. The short answer is, yes, it did.So I could say that the Coolgardie safe, when wicking steadily, ran from a bit over 2.5ºC to 3ºC cooler than the outside temperature, and between 5ºC to perhaps as much as 8ºC cooler when there’s a decent (albeit artificial) breeze.Frankly, I don’t consider these to be amazing results.

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