Drawn up for this Work by Rowland Prosser, Esq., C.E., of Birmingham.

In the first column on the left of the Synoptical Table, are represented little sketches of the principal means employed in the manufacture of welded tubes; next follow the verbal explanations of the sketches; and the group of columns on the right are headed with the names of patentees and the dates of their patents. The dates inserted in these columns, in the same horizontal lines as the sketch - , •re intended to show that such means were employed under the several patents designated by the dates.

For example, running the eye down the first date column, it is to be understood that Benjamin Cook's, the first patent for the manufacture of iron tubes, was dated 1808 - that by him the tube was welded by the hand hammer - finished by the draw-bench and drawing roll* - that the mandril employed was parallel, and lastly that the tube had a scarf or lap joint - and so with all the others.

This tabular view, although most fascinating for a cursory inspection, could not be made to convoy various matters of detail, and points of important yet minute difference, which have existed in the several modes of practice, and which have given rise to many and expensive lawsuits. And therefore, as a brief summary of the entire manufacture, the author subjoins, from the pen of a friend who is professionally and intimately acquainted with the subject, a condensed account, showing the dates, titles, and the main features and processes of the entire series) of patents for making wrought iron tubes.