Footnotes:
Reading edition
[A] Audrey Davis, Department of History of Science, National Museum of History and Technology, Smithsonian Institution, Washington, D.C. 20560. Toby Appel, Charles Willson Peale Papers, National Portrait Gallery, Smithsonian Institution, Washington, D.C. 20560.
[B] “White metal” is the technical term for an undetermined silver colored metal alloy. See discussion of materials at beginning of index.