1From Benjamin Franklin to Jean-Baptiste Le Roy, 25 February 1784 (Franklin Papers)
Copy: American Philosophical Society Enclosed I send you a Letter and sundry Papers I lately recd from Mr. Eckhardt of Utrecht, a most ingenious Mechanician whom I first knew in London. You will see what he desires, and what Answer I have made him. If you can do him any Service, I need not pray you to do it, because you have a Pleasure in assisting Genius: Show if you please what he says of...