I have come across a book No Art without Craft the Life of Theodore Low De Vinne by Irene Tichenor. It refers to a contract made between De Vinne and Hart (Francis Hart & Co (?)) and J M Kronheim in 1866 to purchase Kronheim's plant and rights to use his invention. The contract was cancelled by mutual consent after only 10 months. By 1866 JM Kronheim has sold his share in the London buiness of JM Kronheim & Co and was either still in Germany or had arrived in America, we know he was in New York in 1876. As he was selling his plant (and also buying out his partner) it must be an Amercan business that he was selling (?) Can anyone give any further information regarding the contract, where the information came from for the book or anything regarding J M Kronheim during his working life in America. I have tried to get into touch with the author of the book to no avail, does anyone know how to contact Irene Tichenor?