Photo de stock - A pool table in The Admirals Head pub. Before thermometers were invented, brewers would dip a thumb or finger into the mix to find the right temperature for adding yeast. This thumb in the beer is where we get the phrase rule of thumb.

Photo de stock: A pool table in The Admirals Head pub. Before thermometers were invented, brewers would dip a thumb or finger into the mix to find the right temperature for.

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