@article{ref1,
title="Description of a self-acting safety and fire-extinguishing valve for steam boilers",
journal="Proceedings of the institution of mechanical engineers",
year="1870",
author="Hughes, George D.",
volume="21",
number="1",
pages="219-226",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0020-3483",
doi="10.1243/PIME_PROC_1870_021_016_02",
url="http://dx.doi.org/10.1243/PIME_PROC_1870_021_016_02"
}