1Marcus Dyson to Thomas Jefferson, 6 May 1816 (Jefferson Papers)
I hope you will pardon the liberty I have taken in addressing you, I have no other apology to...
2Enclosure: Marcus Dyson’s Drawing and Description of a Device for Breathing Underwater, [ca. 6 May 1816] (Jefferson Papers)
EXPLANATION A . The reservoir made of copper in form of an half oval (flat Side next the body)...