Pièce 63 - Letter from William Daniel Conybeare

3 pp

WDC is sorry that he wasted any of WW's time. He had thought both WW and Sedgwick had attributed to him an unfounded degree of ignorance which made him annoyed. WDC is now flattered with the attention WW has paid him over his query, which accept for 'some differences rather metaphysical than physical between us' has been settled. When he first made it he only had Faraday's papers before him and had forgot to look at 'earlier writers and see if they had not determined the law of the tangential electro magnetic force, which of course would give me the result I sought as to the Time of revolution by the simplest process'. Barlow [Peter Barlow?] has found the tangential force of galvanic particles on magnetic to be inversely as the squares of the distances and therefore the Times will be directly as the squares of the distances. WW corrects him on his notion of force; 'its strict definition as the cause of change of motion'. WDC accepts this as long as one agrees that motion exists in the first place: 'but here physics seems to me to pass into metaphysics and I cannot conceive but that, recurring to the origin of things a state of rest is more natural than a state of motion - Hence I have a lurking fancy to understand by force not only the cause of a change of existing motion but the original cause of the motion whatsoever...if a tangential force had not been impressed in them at their creation, they would all have huddled together in an heap'.