Editing Depth gauge (section)

== History ==
Experiments in 1659 by [[Robert Boyle]] of the [[Royal Society]] were made using a barometer underwater, and led to [[Boyle's law]].<ref>Jowthhorp, John (editor), ''The Philosophical Transactions and Collections to the end of the Year MDCC: Abridged, And Disposed Under General Heads'',
W. INNYS, 1749, Volume 2, p. 3</ref>  The  French physicist, mathematician and inventor [[Denis Papin]] published ''Recuiel de diverses Pieces touchant quelques novelles Machines'' in 1695, where he proposed a depth gauge for a [[submarine]].<ref>Manstan, Roy R.; Frese Frederic J., Turtle: David Bushnell's Revolutionary Vessel, Yardley, Pa: Westholme Publishing. {{ISBN|978-1-59416-105-6}}. OCLC 369779489, 2010, pp. 37, 121</ref>   
A "sea-gage" for measuring ocean depth was described in ''Philosophia Britannica'' in 1747.<ref>Martin, Benjamin, Philosophia Britannica: Or, A New & Comprehensive System of the Newtonian Philosophy, C. Micklewright & Company, 1747, p. 25</ref> But it wasn't until 1775 and the development of a depth gauge by the inventor, scientific instrument, and clock maker [[Isaac Doolittle]] of [[New Haven, Connecticut]], for [[David Bushnell (inventor)|David Bushnell]]'s submarine the ''[[Turtle (submersible)|Turtle]]'', that one was deployed in an underwater craft.  By the early nineteenth century, "the depth gauge was a standard feature on [[diving bell]]s".<ref>Marstan and Frese, p. 123</ref>