“Maschinen Tractate” - this was found in the Bessler’s possessions after his death, in the form of a number of pages (141) and which contained a message on the front of the volume which stated that he had removed the drawings which depicted how his machine worked but that some one with a penetrating mind could by studying several drawings ultimately discover the secret of its construction. I have reproduced the drawings as they were found.
You can obtain superb archival pictures of Johann Bessler from www.orffyre.com/PrintShop.html