Talk:Existing Technology/@comment-32175668-20170601225424/@comment-32269111-20170612084414

When I was studying chemistry, they had magnetic stirrers. You placed the beaker on what looked like a thick coaster and a metal 'bean' in the beaker. Switch it on and it sitrs itself. Really good with colour-changing experiments - felt properly Hogwarts. I'm sure they'd work with a spoon, too. You can buy these off the shelf (first Google result: https://www.coleparmer.co.uk/i/velp-mst-analog-magnetic-stirrer-100-240-vac-50-60-hz/8657915?PubID=UY&persist=true&ip=no&keyword=&gclid=CjwKEAjw9_jJBRCXycSarr3csWcSJABthk078pcaVZuBPQT9428K08gY6rGG7USGjAGFIQ-JOlnmJhoC0Xrw_wcB) or make them, too (http://www.instructables.com/id/How-to-Make-a-Cheap-Portable-Magnetic-Stirrer/)

Simple and effective!