Paper, regarding extract of malt prepared for brewing in the digester by Denis Papin Account of experiment conducted at the Royal Society with the new digester, to brew beer using malt and water, heating up the digester once the mixture under pressure. Suggests different temperatures could be try and that the method could economise use of malt. Notes that the current digester is too small to produce required quantities of beer, but that a larger one would be easy to make for larger production. 12 May 1686