It works with a little glass flask, that's filled with water and a handful of stainless steel ball bearings, sitting on some electrical elements. Renouf explains how it works at Fullscream:
"The reason I [used ball bearings] was because I wanted to come up with a safe way of boiling the water. I didn’t want the pad to get hot, so I researched induction heating. Induction heating, I’m sure you know, does not make the surface hot, it creates an electomagnetic field which conducts the ferrous material above.
However, I did not want to expose the metal as this would get hot and might not be safe round the user, therefore I wanted to contain the element. After much experimenting it occurred that stainless steel ball bearings (yes they conduct) acted well, and actually created a nice natural alarm once the water boiled. I thought I could work with this! So I did."
The milk is sealed in the alarm by a rubber stopper and stored away from the warmth so it doesn't go bad. "I incorporated a fan which runs simultaneously next to the induction heating element to give an extra cool temperature," Renouf says.
But what about the sugar, you ask? No problem. It’s contained in a little tray under the filter.
Ladies and gentlemen, welcome to the future.
Source: FullScream
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