This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...of grain. He wished to ask the Author whether there was any difficulty from deposit in the retorts, also of what materials the retorts were made? Keith. Mr. James Keith said that on some of the points mentioned in the Paper a little more enlightenment and a few corrections appeared to be necessary. He had been actively engaged, during the past twenty years, in experimenting on the best mode of making a permanent and pure gas from mineral oils, and in applying it to lighting and powor purposes, so as to render the system popular and satisfactory. As a pioneer, therefore, in the successful manufacture and application of mineral oil-gas in this country, and seeing that his name had been mentioned in the Paper, ho might be permitted to supplement the information given by the Author....