Paper on 'Experiments on the Analysis of Heavy Inflammable Air' (1789) published in the Philosophical Transactions of the Royal Society of London in 1780 - (right click, open link in new tab) https://archive.org/details/jstor-106830 - there is a copy of the paper in the packet alongside the handwritten manuscript, possibly written by Austin himself. Manuscript is incomplete, 8 pages along, finishing on page 56 of the article. There is also a copy of Austin's entry in the Dictionary of National Biography in the packet.