Hi Diane,
my gggg grandfather is named Johann Adam Luhn, Oct 12, 1825-1868. He was from Schnyellmanshause Germany. Johann Adam's father was Johann Ernst Luhn, my 5g who married an Ebenau, but I have no dates for his birth or death for the latter. Do you think John Luhn is any relation to Johann Adam or Johann Ernst? If so, I could send more information.