text: In the eighteenth century, with the rise of combustion analysis in chemistry, Stephen Hales invented the pneumatic trough in order to collect gases from the samples of matter he used; while uninterested in the properties of the gases he collected, he wanted to explore how much gas was given off from the materials he burned or let ferment. Hales was successful in preventing the air from losing its "elasticity," i.e. preventing it from experiencing a loss in volume, by bubbling the gas through water, and therefore dissolving the soluble gases.
  After the invention of the pneumatic trough, Stephen Hales continued his research into the different airs, and performed many Newtonian analyses of the various properties of them. He published his book Vegetable Staticks in 1727, which had a profound impact on the field of pneumatic chemistry, as many researchers cited this in their academic papers. In Vegetable Staticks, Hales not only introduced his trough, but also published the results he obtained from the collected air, such as the elasticity and composition of airs along with their ability to mix with others.